I guess any chances of Ueno ending up with someone else are now gone. . . Shame, him and that one woman who actually became his friend and regretted bullying him actually had some chemistry and they would actually be happy together.
I honestly think it's for the best, Ueno shouldn't be with any of the bully girls:
Chiaki: It goes without saying but I cannot see a positive romantic between there's too many negative feelings and Chiaki has shown zero remorse, the best outcome is becoming real friends but im not convinced Chiaki even deserves that.
Kanako: Almost just as abusive as Chiaki albeit slightly justified because of why she does it, still, Kanako holds no romantic feelings for Ueno and both deserve the chance to move on.
Tsubomi: I've seen alot of people supporting her and she has shown the most remorse but even so, the one Ueno loves is Manaka and clearly he's not giving up.
My only worry now is Chiaki throwing a wrench in the works out of spite or something, I just want her conversation with Ueno to be played straight.