You know who i'm gonna feel sorry for? Chika.
You just know she's gonna get her heart broken at some point in the foreseeable future, Sensei will be caught with his pants down (literally in this case) and both of them will probably have some sort of breakdown.
Atleast we still have the time loops, maybe they'll be able to fix things.
She and Rin are the most genuine and emotionally attached girls in the entire class in general, not just to player Sensei, but when they open up, they expose their vulnerable emotional selves to the threat of betrayal or any number of bad things he could do and they won't even know of this threat until it is far too late. I can just imagine the broken husk of Rin, eyes wide, bloodshot, and baggy. Wrists torn to shreds by self-inflicted knife wounds. Her speech, unusual and impulsive as usual with her delirium, wracked by sobs because the one person she opened up to the most destroyed her in one move.
Then there's Chika, who, poor thing, would be on the floor of her house, sobbing with little Chinami and a VERY pissed off Yumi trying to comfort her.
After she succeeds, or feels she cannot, that begins the hunt. Player Sensei is a dead man walking with Yumi looking everywhere for him intent on doing so many unspeakable horrors to him for what he did to her dear friend and her friend's little sister by extension.
Then there's me, though I can't actually do anything to a fictional character. There would be the most gruesome bloodbath humanly possible if I ever had the option to get back at him. He cannot be forgiven for this and I would never forget this most heinous offense.
There's likely going to be alot of that going on. Sensei can't seem to stop hurting everyone close to him (intentionally or otherwise). The time loops/reset might change things back, Makoto for instance, but that seems to just kick the can down the road. Something will give eventually, it won't be pretty.
This might be where the Denpa kicks into high gear, when the loops can no longer just continue to maintain this cycle.