Realistically though people would normally be over it after 7 years especially when they had just barely gotten together so there's likely much more to it than this.

"Realistically" is doing some heavy lifting. Neither Koto or Erika have grown out of their childhood crushes after 7 years. At least Koto tried dating other people but it's strange she couldn't find anyone that'd make her move on from the girl in middle school she briefly dated.
Most people will find they're very different person at 21 than they were at 14 and that they want and expect different things in a romantic partner. "Realistically", Koto would find it increasingly difficult to see a 14 year old Aya as a possible romantic partner because the difference in life experience and maturity are just too great.

So I suppose Aya's running away to Erika's place? She showed a bit of fondness towards her this chapter for helping her get a chance to act again. Wouldn't it become a dramatic triangle if Aya started crushing on Erika instead? I'll be rooting for that chaos (mainly because I'm rooting against a possible het ship between Aya and her coworker/study buddy).

Sometimes it doesn't happen that way. Koto is very likely neurodivergent in some way or another, and given Aya is someone she idealized to an unhealthy degree already, if she has certain neurotypes (borderline personality disorder, etc), it's easy to imagine Aya having become her FP. It's not easy to move on from someone who slots into your brain like that, and you can't just replace them with someone who doesn't scratch your brain in a similar way—which is an explanation as to why she never had a "normal" relationship that felt like it lived up to the feelings of recognition she got from her idealized person paying attention to her.

To imagine, then, that same person reappearing seven years later, exactly the same as they were... only this time, the power dynamic is slanted entirely in Koto's favor, it's very easy to imagine why it'd be a recipe for abuse. Even if she doesn't have BPD, Koto has a number of traumas and brain problems. and they're clearly untreated.

Each chapter feels like a hit to the gut and it's so beautifully composed.

I think the new character introduced this chapter will be somewhat of a normalizing influence—perhaps leading into commentary or nudging on Aya's relationship being toxic and grooming in a way? I dont think that she'll open up about that or anything, but I think showing more "normal" people will have interesting effects on Aya's perception of her current situation.

Yeah the dudes being nice here is definitely great! I want more stories/oneshots where the guys are just supportive as hell like this.

It's certainly nice. Guys in Yuri typically either don't exist or exist only as a drama device. Bloom Into You and Tamen De Gushi are about the only things I can think of off the top of my head where male characters are actual characters rather than just a plot device.

Jun in My Half of You is a fine character as well, honestly.

Seeing the story progressing so far , I don't think it'll go the romance route , subtext at best.

So im just going to my corner and punching air real quick

i think you'll be in for a pleasant surprise.

I'm really happy this story was uploaded here, as i wouldn't have found it otherwise. more manga is always a good thing

Genuinely perturbed at the idea that yanderes are meant to be "likeable," but I guess I'm learning new things everyday!

Well, yes. They're supposed to be wolves in sheep's clothing, aren't they? As well as having that unhinged charm to them. This character doesn't have that, she just comes across like a frat boy who doesn't know what No means.

the character in this isn't engaging at all, and there's immediately no interest shown from the LI. Usually the LI and yandere get involved platonically before the yandere's true colours are revealed, to add a level of disconnect and mixed feelings. this person is simply detestable from the getgo, and is basically just a sexual harasser.