Other than suicide parts, which are stupid, rest are all nice. We need more stories like this, actually we need a complete manga like this. I mean, I never understood why MCs who get bullied by stupid girls never fought back, it's a girl, you are a dude, if she wants to play with you show your biological advantages to her, now I get what I say sounds like some incel shit but come on...
If someone harms you in any way, you fight back. That's that.