Just binge the 24 chapters to catch up, more hints at his mother committing suicide at lover's peeks in the pass, reg finally finding a will to act and his mother character development is quite lovely, the teacher is probably gonna be fine she reminds me of Monika from DDLC so I like regardless...
I've been rereading this and honestly, the teacher is just horny and lonely, otherwise, she is perfectly normal and is, therefore, best girl, chalko is not a romantic interest btw it's just not their vibe.