I can't believe my first time commenting on mangadex after reading so many series here is going to be about this series, but I gotta vent my frustrations out. Fair warning, I'm not gonna spoiler anything because previous comments reveal plenty and honestly, knowing a little bit of what happens ahead of time might help brace you for the dumpster fire. I've read up to chapter 72, for reference.
I'll just start with what I liked about the series. Art is pretty good. Generally clean, and some of the high impact panels are well done. Character premise is interesting, some of the characters are somewhat likeable. And I think that's where I end the list of things I liked about this series.
Now, before I get into it, technically there's no NTR. The original FMC and MC are broken up, they don't get back together, they find new loves and that should be okay. I say should be because the character development, the pacing, the writing is so poorly done, and I think the series is trying to excuse that by basically framing the entire series through the perspective of the main character. We mostly get the thoughts of the main character around his relationships and the plot as a whole, which can be a fine narrative choice if not for the fact that we rarely ever see any internal monologues and actual processing of events from the MC.
The entire time skip of him making it big as an editor that leads to the MC and FMC breaking up is just so rushed, we don't get to see any of what actually happened during that time that led to such a massive change in character, and we hardly get any emotional processing outside of "oh my god this just doesnt feel right I need to get her back". In fact, we hardly see any growth in the main character at all over the course of the series since right after the famous editor/break up arc, he basically goes back to exactly who he was prior to it, and basically stays that way throughout the rest of the current chapters.
While on the topic, the main character is just poorly done. We learn about his poor upbringing and his childhood friend who is in love with him, and you would expect both of these things to tie into main plot after resurfacing from his past to help his growth as a character over the course of the series. Well, instead what you get is a the poverty plot point completely forgotten, and the childhood friend basically turned into a gag whenever the author wants to introduce some tension into the relationship with no longstanding impact from the main character's point of view. He doesn't learn to set clear boundaries in his relationships, he doesn't learn to express his feelings to people that are not main characters, or even talk to them really.
No, instead, these characters get a little moment in the spotlight, then get turned into gags for tension, or just get pretty much written out of the story entirely. Original FMC has a sister that has a crush on MC, and her feelings come up several times during the series, and is basically her entire personality. How does this resolve? Well, sister finds out about MC's new girlfriend, and proceeds to move on all in a single chapter that also features a 10 year time skip of her being with someone else. This happens over the course of basically one chapter. MC basically has no reaction to this information, no internal thoughts about it. I think the walls of my apartment building have more emotional expression than him; I can at least imagine them to be crying when it rains, whereas I suspect this MC's eyeballs are actually just little balls of water that he squeezes when he's apologizing because he doesn't know how to do anything else.
As for the childhood friend, well, she's just another gag. MC gets caught hanging with her under suspicious and precarious circumstances several times, and never fucking learns to set boundaries, or even THINK about setting boundaries even when he gets caught. This emotional and communicational underdevelopment also means that he thinks begging for forgiveness and saying "I'll do better next time!" without ever actually doing better is how he should handle these situations. How is this resolved? Childhood friend takes him to a hotel, confesses to him again while they're both half naked, and then, while the MC is trying to figure out what to say (as if saying "sorry, I love my current girlfriend and I don't see you that way" was still too difficult because he never learned from his previous mistakes), she tells him she's going out with someone else. I'm unsure about whether or not that's the truth, or if she's saying that simply because she wants to spare his feelings, but wow these characters are completely insufferable either way.
Let's talk about what happens after the breakup, because what the author does is just egregious. We get a completely unexplained "Let's stay broken up", followed by a time skip and then an unexplained "they got married". Happy ending right? Wrong. Then we go BACK in time, BACK to the breakup, and pick up where we left off. No explanation, no understanding of whatever the hell is going on in this series, nah we just go back. Instead, we're given the gyaru JK FMC to replace the Yankee JK FMC. From there, its basically the same cycle. She only slightly less physically aggressive, but makes up for it with being manipulative. Outside of that, she's basically the same character. Outstanding up and coming mangaka, pulls him around with her and falls in love with him. Honestly, it's a little more polished the second time around, but somehow we're fumbling our way into sunshine and rainbows for the MC.
Last but not least, I want to talk about the moment that wrenches our hearts and makes us laugh from absurdity while we wonder exactly how we got to this specific moment in the plot after all of the prior events. Of course, I'm talking about the moment MC finds out yankee FMC's seeing someone else. Yeah, if the mangaka wanted to hurt the reader, yeah it stings. He gets an email with a photo of her kissing an actor that worked on the film adaptation of her first work. You know how I can tell the mangaka is really just trying to hurt us? The following chapter, the MC confronts her about it for one page. Then they all leave and do other things, and the chapter ENDS with the yankee FMC asking her new bf to have sex with her. Ouch. The chapter after that starts off with them starting to have sex, but it's revealed that the new bf doesn't want the first time to be like this, and wants their first time to be special because he's had so much sex with other idols, actresses etc.
You know, the crazy part about the new bf saying he wants the first time to be special, is that the MC ALSO wanted the same thing the first time he was about to have sex with the yankee MC, way back in the early chapters of the series. Instead of explaining that to her, he ends up making some bullshit, and then has their first time after they have a big fight as if the MC completely forgot about wanting the first time to be special. Do we ever get any explanation on why the MC just forgot about that? Do we get any explanation for any of how this went down? No. It feels like it's all written to simply hurt and betray the emotional investment of the reader. Do we get her perspective, or the MC's thoughts, for that matter? Nah. They meet, she tells him "I found myself a boyfriend, get over it", and then he's saved by the new gyaru MC, who comes in to save MC pretty much right after all of this goes down. And guess what? Just like when the yankee FMC and MC were about to have sex, MC finds out the gyaru is a virgin who hasn't even had her first kiss yet.
Now, I get it. To some extent, it's emotionally raw. We get an emotionally stunted MC, powerful and moving moments, and interesting character premises. The issue is simply in the writing; it lacks the depth of character exploration and it's simply wishwashy and empty in how it handles character development after major moment. The MC is basically the same character he's always been, the yankee FMC is aggressively shoved aside with little thought to make way for the new gyaru FMC, all the side characters are gags that are brought in for random tension and eventually written out in 10 pages with little impact on the overall plot.
I can see some arguments for why this manga exists. Perhaps the mangaka wants us to draw our own conclusions about how we arrived where we are, and is asking us to connect the dotted lines. Personally, I think this particular work is asking for too much of the reader. Perhaps the mangaka just wanted to take the reader on an emotional ride simple for the sake of it. Perhaps they started off super interested in the premise and characters, but got bored and needed new direction and decided to haphazardly mess around with the characters. Personally, this piece makes me wish I stuck to more popular manga titles instead of digging for the diamond in the rough and I'm going to try my best to forget this manga exists.
Oh, and did I mention that the main character shitting himself on a date both resolves an argument and makes the gyaru fall more in love with him? Bro is so scared of his lovers he can't tell them he needs to use the bathroom. Frankly, it's hard to imagine he's an editor when he's this lacking in communication and social skills. Half your job is being a mediator with and between parties! Where did all of that go?
TL;DR: I would rather you go read Domestic Girlfriend or anything else; don't read this expecting a happy journey or happy ending. It's "wtf did i just read", but the "wtf" is more in the writing than the premise.