...
......
Okay, I'm at a loss. What the hell is going on?
The girls at the classroom were reacting just as if Touka was dead, but the MC recognized her fingers so there's no doubt it's her and not a lookalike or twin or whatever. And why be so mean to the girl she was so friendly before?
Don't tell me it's the old "I realized you have a crush on me so I must push you away for your own good even though I return your feelings" trope...