Okay it's cute but I'm kinda lost like... there has to be a better in universe reason for this. This chapter just established that all versions of Karin have the same home life and up until they were split were the same person SO WHERE DID THIS NEW ONE COME FROM??? For that matter how did two Karin's leave their house without noticing the other in the intro chapter. And I'm still not getting why the charm couldn't just go "whoops, I'll just wish them all back into one person" instead of the whole "who you don't like will get sent into the shadow realm" because... I mean isn't it bad when your would gets split and one of those pieces cease to exist 😅.
Like I know I care a lot, but this would have been a pretty easy thing to better establish. Just have the charm try to wish away it's misunderstanding wish and then explain it can't without enough love or whatever. Now the MC has to collect all the prices of Karin's soul and love them enough to make a wish to reunite her (could even give a time limit before they permanently disappear). Or just give it a "yeah, I can't undo this because blah blah blah" and call it a day. Just an acknowledgment would have been nice.