TL;DR of the story, Grooming, Sexual Assault (just rape tbh).
None of the characters get what they deserve though, which is probably just like real life...?
I wouldn't know, I'm not a teacher that has sex with underage kids lmao.
Sei sucks ass, I don't know how she's a functioning human. She should 100% be in jail, or at least get some punishment, the story did nothing to her. Aya got manipulated into liking Sei by...getting molested?? What even..? The childhood friend, i don't even know what the fuck happened later on. The random kid that suddenly falls in love with Sei after she sexually harasses her and finally, Yoru, the trash-magnet. At least she seemed to be normal...until they revealed that she liked watching Sei be desperate for her or some shit.
Honestly, there was no way for this story to end any other way than this I guess.
Sei became unredeemable the moment she laid hands on Aya. There's no way the story could have redeemed her without it being more creepy than it already is.
Aya would probably end up like something similar to Sei, which she did in the end.
Yoru seemed like she liked Sei, but didn't act up on it. Probably due to Het relations being the norm, or due to her immaturity. We don't know (I think). As proven by her final note given to Aya.
The childhood friend would probably end up normal-ish I guess?
And that random ass kid as well.
Just 21 chapters of Drama and an underaged kid getting groomed.