Is Haruki really a hero? From what I recall, she helps isolate Aya from other people, ensuring that she can't make any friends. Despite that, she doesn't actually hang out with Aya during classes or lunch, instead preferring to hang out with her 2 groupies.
She seems to be a genuinely negative force in Aya's life, and even her current activity that's sort of noble (breaking up Aya and Sei) is being done for the wrong reason (jealousy).
Despite all this, Haruki is probably the least flawed/bad person in this manga. But that's an incredibly low bar.
Edit: You appear to be 'headcanoning' a lot of things. Sei is not some master planner. She's running purely off emotions, using Aya for release. Her not-so-subtle brag to Haruki (the picture she sent) and letting Mochida listen in to their conversation seems to have been done purely for a (probably sexual) thrill. Aya is mad because Sei cheated on her with Yoru. She knew it was a possibility, but she's still really upset that it actually happened (Aya in Ch16: "I know, but..." in response to Sei's excuse).
It's not more complicated than that.
As for whether Aya is in love with Sei or it's just some combination of lust and jealousy, it appears to be the former based on the amount of non-sexual activities she partakes in with Sei (cooking for her and nursing her back to health twice). But I don't think there's enough information to say for sure either way. You can't just pull a background detail like book-reading out of the story and headcanon an explanation that has Aya at the center of some kind of psychological complex where she can't distinguish fantasy vs reality.
I'm not trying to excuse Sei, either. An adult who sleeps with a minor is still in the wrong even if the minor is in love with them. I'm not saying love would make it right.
Everyone in this manga is heavily flawed, and that's what I like about it. Even the ones that aren't flawed in a large number of ways (like Mochida) end up taking horrific actions (well, if she goes through with outing Sei, that's one of the most horrible things you could do to somebody).
last edited at Oct 21, 2020 11:54PM