Osananajimi wo Erabenai! - Ch. 10 - And That's Exactly Why

[invaliduserlolidkbruh]

You guys think the clones are gonna stop at some point or it'll get to the point where her mom pushing out 23 kids in one day is canon

this is so funny 🤣

 

[homerman87]

Interesting, so Aika is like a portion of Karin retained from before the move, which actually explains a lot about her lack of maturity in this arc since it's like a younger personality injected into a body that is otherwise a teen.

 

[homerman87]

That's definitely another possible interpretation, but you really can't just say that I was "grossly misinterpreting what she said." You're not the author. You don't know what they meant by that line or what they meant to imply.

I was pointing out that she seems to be almost dissociating from most of her memories before the split. If they were clones, they should have complete, totally rememberable memories that just start changing after the split points. Instead, though, it seems like they've been given a certain subsection of the original Karin's memories.

If we assume that that's what actually happened, then the question is: Were new "empty" Karins created to receive these memories? Or were people that already existed given the memories? The former has the issue of needing massive alterations to the past. The latter only has to change the present. Occam's Razor thus deems the latter the more likely of the two.

Occam's Razor doesn't really fit your explanation. We know that the Charm clearly adjusts reality because it alters the house and the records of the school each time a new Karin is blipped into existence. The big flaw to your idea is that it would mean that some people are randomly disappearing when a new Karin appears, and yet, there are no signs that this is the case. Considering the Charm can can create entire rooms that match each Karin quite perfectly, it's a lot simpler to believe that the Charm is capable of creating Karin's based on the how she would have grown up if she had retained a given side of herself as her prominent personality, rather than the charm abducting random people and changing their bodies and minds to suit the needs of the wish. As for why some of the memories are hazy, it should be noted that none of them remember the wish that the original Karin made, so it's likely a point in the direction of the fact that there's still a mystery surrounding the wish and why it was made. There also seems to be hinting that each personality represents different parts of her life, which would also affect the memories of each Karin as they remember things in ways slightly biased towards their given personality, such as Kumaka obsessing over the memory of her friends talking badly about her, do note though that Himeka also remembers this even, and Aika being fixated on how she was before the move, but they do all seem to remember the same things, though they also don't have all of the originals memories. We also have to consider that the charm's power is likely being stretched thin since there was only ever supposed to be one Karin that remained, but now it is overextending on the original wish, which may play into whatever events will likely result in the Karin's becoming whole again.

 

[Friendly-Sentence710]

Urumin's greatest student.

Is falling in love with yourself considered incest?

No its just Narcissism.

 

[Blackspace_2]

Weiner King should be 1st. also whats isekai gyoza sound tasty

 

[Lunkli]

Occam's Razor doesn't really fit your explanation. We know that the Charm clearly adjusts reality because it alters the house and the records of the school each time a new Karin is blipped into existence. The big flaw to your idea is that it would mean that some people are randomly disappearing when a new Karin appears, and yet, there are no signs that this is the case. Considering the Charm can can create entire rooms that match each Karin quite perfectly, it's a lot simpler to believe that the Charm is capable of creating Karin's based on the how she would have grown up if she had retained a given side of herself as her prominent personality, rather than the charm abducting random people and changing their bodies and minds to suit the needs of the wish. As for why some of the memories are hazy, it should be noted that none of them remember the wish that the original Karin made, so it's likely a point in the direction of the fact that there's still a mystery surrounding the wish and why it was made. There also seems to be hinting that each personality represents different parts of her life, which would also affect the memories of each Karin as they remember things in ways slightly biased towards their given personality, such as Kumaka obsessing over the memory of her friends talking badly about her, do note though that Himeka also remembers this even, and Aika being fixated on how she was before the move, but they do all seem to remember the same things, though they also don't have all of the originals memories. We also have to consider that the charm's power is likely being stretched thin since there was only ever supposed to be one Karin that remained, but now it is overextending on the original wish, which may play into whatever events will likely result in the Karin's becoming whole again.

Actually, the stuff you're pointing out is the whole reason I think my solution is "simpler." I imagine that the people becoming the new Karins are people that were transferring in anyways. The only things after that being changed are people's memories of them and their appearance. The people that used to know them still know them, just now it's as "Machihashi Karin" rather than whoever they used to be, meaning no one really "disappears." And the rooms would just be being transplanted from their old homes from before becoming a Karin.

And I've thought from the beginning that the Karins the charm has been creating were created specifically for Yuu, so they don't know anything about the original Karin that he didn't also know at some point. That being why they only remember the details of their past relating to him. They don't remember what wish they made because Yuu doesn't know what wish she made. And I actually believe this theory, unlike the replacement theory, which is just "This is a reasonable explanation that would be interesting to see if not for the tonal dissonance."

In terms of the RP theory, though, the shared memories with different amounts of focus would come from their original identity's memories of this time matching themselves to Yuu's memories of Karin's life. Kumaka and Karin both had memories of being spoken badly of, so Kumaka's feelings from that were stitched on to Karin's memories of that. Himeka then has the memories, because those came from Karin through Yuu, but she doesn't have the feelings, which are Kumaka's own. She doesn't care because she never had something like that happen to her; there were no similar feelings to attach.

 

[orechan]

yuu is such a good boyfriend to all the karins
(btw you guys have CRAZY attention to detail typesetting and clrd wise, bravo )

 

[homerman87]

Actually, the stuff you're pointing out is the whole reason I think my solution is "simpler." I imagine that the people becoming the new Karins are people that were transferring in anyways. The only things after that being changed are people's memories of them and their appearance. The people that used to know them still know them, just now it's as "Machihashi Karin" rather than whoever they used to be, meaning no one really "disappears." And the rooms would just be being transplanted from their old homes from before becoming a Karin.

And I've thought from the beginning that the Karins the charm has been creating were created specifically for Yuu, so they don't know anything about the original Karin that he didn't also know at some point. That being why they only remember the details of their past relating to him. They don't remember what wish they made because Yuu doesn't know what wish she made. And I actually believe this theory, unlike the replacement theory, which is just "This is a reasonable explanation that would be interesting to see if not for the tonal dissonance."

In terms of the RP theory, though, the shared memories with different amounts of focus would come from their original identity's memories of this time matching themselves to Yuu's memories of Karin's life. Kumaka and Karin both had memories of being spoken badly of, so Kumaka's feelings from that were stitched on to Karin's memories of that. Himeka then has the memories, because those came from Karin through Yuu, but she doesn't have the feelings, which are Kumaka's own. She doesn't care because she never had something like that happen to her; there were no similar feelings to attach.

Ok, so first off, how is that simpler? You'd still have people randomly disappearing that nobody is reacting to, and now you're introducing that the people in question all just happened to have rooms A. perfect for each Karin personality and B. that contain elements such as copies of the same stuffed bear and charm that Karin took with her. You're also supposing that this school just has that many people naturally transferring to it in the middle of the year, which is also a reach.

It should also be noted that they do remember things from after the move, the memory Kumaka fixated on was with Karin's "friends" from after the move, for instance. And oh boy does that last paragraph make a lot of assumptions that don't really hold up under scrutiny, like how part of the reason all of this is the way it is is because of Karin's wish, not just Yuu's, so it doesn't really make much sense that only his side of things is considered.

Now overall your theory is fine and plausible, I'm apologize if I make it seem like it isn't. I'm just pointing out that it really doesn't fit Occam's Razor because it requires a lot of assumptions and is too complex, especially since the simplest answer really is just that the Charm creates each Karin persona since that's literally what we see it do, anything else is just overcomplicating things. The charm is basically a divine being at this point (something that fits Japanese mythology through entities known as tsukumogami, basically ordinary objects granted divine powers because of how they cared for.) Now yes that divine power should be limited, such as hints at Aika fading and fainting as she rejects the others, and that'll most likely come into play, but I don't think creating new Karins is really any more intensive than abducting people that happen to be transferring in, making them look like Karin, and then completely altering their personalities and memories, in fact, the latter sounds more difficult because you'd have to completely manipulate a person's free will 🤔

 

[Kronik-ken]

Is falling in love with yourself considered incest?

It's considered selfcest and not incest if you fall in love with yourself

 

[Lunkli]

Ok, so first off, how is that simpler? You'd still have people randomly disappearing that nobody is reacting to, and now you're introducing that the people in question all just happened to have rooms A. perfect for each Karin personality and B. that contain elements such as copies of the same stuffed bear and charm that Karin took with her. You're also supposing that this school just has that many people naturally transferring to it in the middle of the year, which is also a reach.

Nobody is reacting to their "disappearance" because they aren't disappearing. Everyone's memories have been changed to remember them as "Machihashi Karin." Their parents don't think anything's wrong because "why would Machihashi Karin be living in my house?" The friends don't realize anything's wrong because the only thing that changed was her name. &c.

Also, a lot of people transferring in isn't that strange if a lot of cheap housing opened up around here, considering it does seem like a pretty nice place to live. "When good cheap housing opens up somewhere, a lot of people move there." Simple as that.

And oh boy does that last paragraph make a lot of assumptions that don't really hold up under scrutiny, like how part of the reason all of this is the way it is is because of Karin's wish, not just Yuu's, so it doesn't really make much sense that only his side of things is considered.

Was it part of Karin's wish? I just skimmed the earlier chapters, and there doesn't seem to be any indication of that. Plus, as was mentioned, none of them know what her wish even was. It's explicitly stated that this happened because he kept wishing for her to come back. Maybe I just missed something, though.

Also, something that I want to say is that the current "split apart" solution doesn't give any good explanation for why there are multiple Karins. Why couldn't it just bring the original back? The charm makes the excuse of "more is better" but it contradicts that by only allowing the one he chooses to exist. The RP theory can at least justify this as "The real Karin is unavailable, and any individual copy created through the name change wouldn't necessarily match her. Thus, multiple are needed to ensure that Yuu will consider at least one to be a valid 'Machihashi Karin.'" Of course, Yuu's accepting them all, but we know that the charm expect that. Presumably, it originally intended to turn the rest back after Yuu chose one.

completely altering their personalities and memories, in fact, the latter sounds more difficult because you'd have to completely manipulate a person's free will 🤔

And wouldn't splitting Karin be altering her personality and memories? The different Karins clearly have different memories and personalities after a certain point despite seemingly only coming into existence just before meeting Yuu, as evidenced by the rooms appearing in the house only after meeting him despite them all initially believing that they lived there alone.

Also, I think you're misunderstanding the basis of the RP theory. No personality change has occured; Each Karin's personality is the exact same personality as the one of they had before they became "Machihashi Karin." That's why they have different personalities in the first place.

 

[homerman87]

Nobody is reacting to their "disappearance" because they aren't disappearing. Everyone's memories have been changed to remember them as "Machihashi Karin." Their parents don't think anything's wrong because "why would Machihashi Karin be living in my house?" The friends don't realize anything's wrong because the only thing that changed was her name. &c.

Also, a lot of people transferring in isn't that strange if a lot of cheap housing opened up around here, considering it does seem like a pretty nice place to live. "When good cheap housing opens up somewhere, a lot of people move there." Simple as that.


Was it part of Karin's wish? I just skimmed the earlier chapters, and there doesn't seem to be any indication of that. Plus, as was mentioned, none of them know what her wish even was. It's explicitly stated that this happened because he kept wishing for her to come back. Maybe I just missed something, though.

Also, something that I want to say is that the current "split apart" solution doesn't give any good explanation for why there are multiple Karins. Why couldn't it just bring the original back? The charm makes the excuse of "more is better" but it contradicts that by only allowing the one he chooses to exist. The RP theory can at least justify this as "The real Karin is unavailable, and any individual copy created through the name change wouldn't necessarily match her. Thus, multiple are needed to ensure that Yuu will consider at least one to be a valid 'Machihashi Karin.'" Of course, Yuu's accepting them all, but we know that the charm expect that. Presumably, it originally intended to turn the rest back after Yuu chose one.


And wouldn't splitting Karin be altering her personality and memories? The different Karins clearly have different memories and personalities after a certain point despite seemingly only coming into existence just before meeting Yuu, as evidenced by the rooms appearing in the house only after meeting him despite them all initially believing that they lived there alone.

Also, I think you're misunderstanding the basis of the RP theory. No personality change has occured; Each Karin's personality is the exact same personality as the one of they had before they became "Machihashi Karin." That's why they have different personalities in the first place.

See the biggest problem with your theory in relation to Occam's Razor is that you have to add stuff in like "a bunch of cheap housing opened up" without any justification in story for this fact. You say that nobody has disappeared, but now there a number of parents that are suddenly minus one kid while another household is plus one kid, despite the fact that we have proof that the only people whose minds have been altered is Karin's parents now believing they have multiple daughters. The school is just informed there's a new transfer student for that class and the only thing affecting the class is that they're a bit too accepting of the circumstances, unlike Yuu and the Karin's which are surprised.

As for what I mentioned about Karin's wish, it's stated that the reason the Karin that isn't accepted by Yuu is doomed to disappear is in relation to Karin's unknown wish, with them being split being implied to be connected to that in combination with Yuu's multiple wishes. Which actually brings me to one of the biggest hang ups with your theory in relation to Occam's Razor, the fact that we are told that any Karin that isn't chosen by Yuu, and accepts his choice in return, is doomed to disappear. This fact doesn't outright reject your theory, which is why I said I'm not trying to disprove it, but it does throw a wrench into the idea that your theory is the simplest since it doesn't make much sense to say they "disappear" as that implies their existence is tied to being chosen by Yuu. Yes the charm didn't expect that Yuu would accept them all, the charm even pretty much said they'd both disappear if Yuu didn't choose either. Also, in the theory, if the intent was to return those taken to normal, why continue to add more Karin's to the mix and continue to add in the idea that the next will also disappear if both conditions of him confessing and each Karin accepting aren't met in a given time frame? That's just needlessly involving more and more people since the charm now knows Yuu chooses all of Karin, but that doesn't mean all Karin's will choose to accept the circumstances, like how Aika sought to be the only one.

Finally, you say no personality change has occurred, but that creates a new headache because that now means that each transferring girl just happens to match a different aspect of Karin's personality, this also would mean that Yuu isn't really choosing Karin, he's just choosing some girl that look and thinks she's Karin, which fails the premise of the series. I'm sorry, but the more that you try to defend your theory as the "simplest" solution, the more you condemn it with points that actually tear new holes into it as you try to rationalize all of your points.

You say that each Karin has different memories, but the only difference in their memories, that we've been shown, is that they fixate on different points in their life, and reflect on them differently. The only thing that we have confirmation of is that memories just before the split are kind of hazy, but past that they all remember their time with Yuu and then at least some of their life after the move (as proven by Himeka and Kumaka who share the same memories of playing with new friends and then hearing said friends bad mouth her behind her back, though the two reflect on that moment in different ways.) You brought up at one point that the charm would have to rewrite history for each new Karin blipped into existence, but the only things that actually change is the Mother's believing she has one more daughter (which I wonder if she might know about the true circumstances, maybe her memories aren't actually being altered,) the house gaining new rooms because magic, and the school records noting a new transfer student (possibly the classroom increasing in size, we aren't entirely sure,) nothing about the past is implied to change, and it doesn't have to. The fact is that we see what appears to be the charm creating various things from nothing, especially important items from Karin's past, such as the charm and teddy bear, but no indication of your theory. Occam's Razor then implies that it most likely the case that these Karin's blip into existence and blip out of existence if they aren't chosen by Yuu. Other possibilities exist, but anything else requires a lot more information than we have to justify.

As I've said, it's not that your theory is invalid, it's an interesting idea, not one I agree with for this series, but it's an interesting possibility. The problem is in the fact that you try to defend it to the death as the "simplest" solution and reject any notion that there are faults in your logic (outside of your initial understanding that it's likely too dark for this particular series to really fit.)

 

[BlargET]

This discussion is all well and good, but we're clearly neglecting the real mystery:
What the heck an isekai gyoza is and how a stand hawking them beat out every Karin in the competition. Is one of the students importing food from a fantasy-cooking hybrid manga?

I'm glad I'm not the only one who read through all the other stalls that they lost to. Which is bullshit by the way but yeah you bring up a good point. The others? Haunted house? Yeah standard. Dance show? Standard. A performance play? Standard. But the hell is isekai gyoza? I need more context!

 

[BlargET]

Bro made his own merchandise. He really is make Rentarou proud👏.

 

[Lunkli]

See the biggest problem with your theory in relation to Occam's Razor is that you have to add stuff in like "a bunch of cheap housing opened up" without any justification in story for this fact. You say that nobody has disappeared, but now there a number of parents that are suddenly minus one kid while another household is plus one kid, despite the fact that we have proof that the only people whose minds have been altered is Karin's parents now believing they have multiple daughters. The school is just informed there's a new transfer student for that class and the only thing affecting the class is that they're a bit too accepting of the circumstances, unlike Yuu and the Karin's which are surprised.

New housing is created all the time. That's not something you really have to justify. Also, we don't have proof that only Karin's parents have had their memories altered. It'd actually be impossible to prove that without checking every other person individually anyways, (And there's always the possibility of someone's memories being altered between checks) so I'll doubt we'll ever have proof of that.

And, anyways, remember that I'm not saying people's memories are being totally changed. It's just switching each of the Karins' identities in their memories from "Whoever" to "Machihashi Karin." As long as no conflicts are created, everything else stays exactly the same. One of these conflicts would be with parents, but we've seen that the charm's able to make people accept strange things as normal— like having several girls with the exact same name and appearance. So they probably just think "Huh, that Machihashi Karin girl who isn't related to us sure came to our house a lot."

As for what I mentioned about Karin's wish, it's stated that the reason the Karin that isn't accepted by Yuu is doomed to disappear is in relation to Karin's unknown wish, with them being split being implied to be connected to that. Which actually brings me to one of the biggest hang ups with your theory in relation to Occam's Razor, the fact that we are told that any Karin that isn't chosen by Yuu, and accepts his choice in return, is doomed to disappear. This fact doesn't outright reject your theory, which is why I said I'm not trying to disprove it, but it does throw a wrench into the idea that your theory is the simplest since it doesn't make much sense to say they "disappear" as that implies their existence is tied to being chosen by Yuu. Yes the charm didn't expect that Yuu would accept them all, the charm even pretty much said they'd both disappear if Yuu didn't choose either. Also, in the theory, if the intent was to return those taken to normal, why continue to add more Karin's to the mix and continue to add in the idea that the next will also disappear if both conditions of him confessing and each Karin accepting aren't met in a given time frame? That's just needlessly involving more and more people since the charm now knows Yuu chooses all of Karin, but that doesn't mean all Karin's will choose to accept the circumstances, like how Aika sought to be the only one.

"Implied" does not mean the same thing as "confirmed." I didn't even think of it as "implied" before this at all. We really have no idea what her wish was right now.

And I don't get why you think the disappearing hurts the RP theory, as I mentioned it in the comment your replying to. The "disappearance" would be the unchosen Karins going back to the people they were originally. These "Machihashi Karins" stop "existing" and the people they were before start "existing" again. And they'd of course all disappear if he didn't choose any of them because if his wish isn't going to be fulfilled, they should be returned to their original life.

So I actually think this helps the RP theory due to the fact that it gives a reason for them to have to disappear.

And the fact that more and more Karins are appearing is a question that effects any interpretation right now, not just RP. If he split her, why does the charm continue to do so and threaten their disappearance? For any theory right now, I think the most likely answer is that the charm is trying to find one that he'll choose as the "one" Karin so that the Karin number paradox can be resolved.

It's possible Aika was chosen to become a Karin specifically for the fact that she wouldn't accept the multiple Karins arrangement and could potentially force him to choose just her. If he did so, the rest could go back to normal. (Or get merged back into the singular Karin.)

Finally, you say no personality change has occurred, but that creates a new headache because that now means that each transferring girl just happens to match a different aspect of Karin's personality, this also would mean that Yuu isn't really choosing Karin, he's just choosing some girl that look and thinks she's Karin, which fails the premise of the series.

All of the personality traits we've seen are traits that everyone has in some amount. Everyone feels a bit lazy, energetic, shy, proud, &c. sometimes. If we got a murderous Karin and found out past Karin had murderous tendencies, that'd be different, but that's not the sort of character we're getting.

And, yeah, it's against the premise of the story, but that doesn't mean it won't happen. Dandadan, for example, has premise that's subverted eventually. (Both Okarun and Momo end up believing in both aliens and the supernatural. The former
doesn't even have powers anymore right now in the manga.) A story is not obligated to follow through on its intitial premise. That's like the whole reason "plot twist" is a term.

I'm sorry, but the more that you try to defend your theory as the "simplest" solution, the more you condemn it with points that actually tear new holes into it as you try to rationalize all of your points.

I think this is a bit unfair, as your pretty much always going with the most infavorable interpretation of the theory. Everything I've said about it so far has been what I consider to be a natural extension of the original premise. I couple times you've even brought up the same "flaw" immediately after I explained it.

Also, the splitting theory has plenty of wholes as well:

• Aika is shown to have had a life for at least a couple of days before getting a room at the Machihashi household in which she was able to go viral. Where was she living at this time?
• If the original was "split" why do we have a growing number of Karins without any changes to the ones we already have? If both Aika and Galka are parts of the original, that would mean the original was split into two. The original doesn't exist anymore, and instead we have two "half-Karins." (This is the only way for both of them to actually be "Machihashi Karin" such that the RP Karins wouldn't be. If the original still exists, they are unique entities from her, just like the RPs.) That would mean that any new Karins have to split off of one of those two, right? And yet they've stayed exactly the same as they were at the start, so they can't both be "quarter-Karins" right now. So where did Kumaka and Aika come from?
• Why do they have to disappear?
• Why couldn't the original Karin have just appeared as is? Why did they have to split?

As I've said, it's not that your theory is invalid, it's an interesting idea, not one I agree with for this series, but it's an interesting possibility. The problem is in the fact that you try to defend it to the death as the "simplest" solution and reject any notion that there are faults in your logic (outside of your initial understanding that it's likely too dark for this particular series to really fit.)

I've just been correcting your misunderstandings this whole time. I'm not "defending it to the death." There also aren't any "faults in my logic;" I'm not sure what you're talking about there. I've countered all your attempts to point these out pretty much entirely effortlessly and without introducing anything new to the theory since the beginning, and, anyways, none of the things you've pointed out have anything to do with "logic." You've never countered anything I've already said outside of the premise as a whole.

Also, I'm pretty sure I've said it before, but I'll say it again: I don't actually think this is what's actually going to happen, even if I don't believe they've actually been split. (I'm instead pretty sure that they're totally fabricated Karins created by the charm. It of course requires the charm to have way more powers than we know of now, but not really any more than the splitting theory, and it makes it really easy to explain everything. It'd also give a nice narrative opportunity for the real Karin to come back later.) But regardless, this is a valid, reasonable interpretation that logically fits just as well as any other and is simpler in some regards.

Like, lets just stop this, okay?

 

[MarqFJA87]

@homerman87 I'm really glad that some more eloquent and well-versed in the subject like you is tackling this, because I have not the patience or time to get drawn into a long-running argument with someone like this who keeps arguing in circles and in almost obvious bad faith. I've already put him on my ignore list because I can't stand anyone trying to push a very clearly weakly-supported-at-best interpretation as if it's unquestionably more sensible than the most straightforward explanation, let alone subtly moving the goalposts by acting like they only consider it equally valid rather than more valid when directly challenged.

 

[homerman87]

Like, lets just stop this, okay?

This is okay with me, as I have said, I'm not trying to fully invalidate your theory. My points have all been with regards to your sentiment that Occam's razor backs your claim, when your claim requires the introduction of unknown elements to be correct, such as the idea that many new transfers to the area are occuring. It's not just if you find something simpler, it's also the understanding that you should simplify your understanding of the problem, if your answer requires the addition of more information, then it likely isn't the correct approach.

Edit: To give an example, the simplest answer to all of this is that this is all a dream in Yuu's head, but that doesn't mean that's the correct answer via Occam's Razor since it requires the assumption this is all fake (which I guess technically it is, but you know what I mean,) there's a bit more to the philosophical concept than just whether or not one can consider an answer "simple" from a subjective viewpoint.

 

[Lunkli]

This is okay with me, as I have said, I'm not trying to fully invalidate your theory. My points have all been with regards to your sentiment that Occam's razor backs your claim, when your claim requires the introduction of unknown elements to be correct, such as the idea that many new transfers to the area are occuring. It's not just if you find something simpler, it's also the understanding that you should simplify your understanding of the problem, if your answer requires the addition of more information, then it likely isn't the correct approach.

All I'm saying is that any theory is going to require the introduction of new information. The information that RP introduces feels less egregious to me than what the split theory introduces, which also, from my perspective, has a lot of holes. That's all.

 

[Karretch]

You know, there's an even simpler reason for the memories before the split fading. It's called "growing up and memories naturally fading like in real life".

 

[Takuma_Aki]

You know, there's an even simpler reason for the memories before the split fading. It's called "growing up and memories naturally fading like in real life".

Or as someone pointed out in some previous chapters that each Karins seems to be the personality she developed -- or to be more precise from the premise of the latest chapter, become dominant -- in different stages of life and even seems to come in the succession even.
After the first two personalities he knows, she then become introvert after learning about her friends' thought about her. After that, instead of back off from others, she revert to being bright & cool and pushed everyone off instead.

Those are different stages of her life and assuming their memory might have different dominant part either?

OR
another simple, bare bone explanation: since they're split, their memory are also fragmented. That's it. That's all there is to it. No need for explanation of people got turned into Karin and whatnot.

---

Also, if we look from the overarching theme/moral of the series that this is Karin learning to accept all the facets of herself through seeing that Yuu, the man she loves, also loves and accepts every and all aspects of herself, the premise of people got turned into Karin won't make sense. It has to be Karin herself being split, and for Yuu to accept all of her with open arm (and also make her accept that part of herself) for it to hold any meaning.

My back is Ch.2 P.19, the charm said:

Whoever you do not choose will disappear.
...As that is her wish

The message here is Karin doesn't accept parts of herself and likely believe Yuu will hate some aspects of her; in the mix of Yuu wanting to see her and the charm said it thinks the more the merrier, she did has a say in this shenanigan that she wants the part Yuu doesn't want of her to disappear. After that we also learn from Kumaka arc that it's not only Yuu who has to accept that aspect of her, but Karin herself will have to accept it, too, otherwise she'll disappear. Hence, I reach my conclusion above that the core of this story is Karin learning to accept herself through seeing Yuu accepts and loves all the facets of her. And all these wouldn't work if they're all different people changed into her. That undermine the premise that Yuu loves her, and becomes anyone that looks and acts like her.

 

[Anothis]

Is falling in love with yourself considered incest?

No that's just good mental health.