Sensei flipped her shit.
Reiji got self aware of his status as the pushover of the town and wants to stop that. Oh boy, he's fucked up when Sensei or Gen spot him again.
Such a letdown there's no chapter till end of january.
I kind of understand Rei's point of view, that "fool me twice" thing, but I'm sure that deep down he knows Chako is different, or maybe he doesn't think so because he lost all trust.
While I know the sensei is already crazy but why did chako slap him just cause she felt like it? It's obvious it was out of jealousy this dumbass is gonna make him hate her as well then she expects him to take her hand wtf can't believe I thought she was the only good person in this series no one is a good person.