Juujika no Rokunin imo is a way better example than Maria no Danzai. Juujika went on for over 200 chapters, whereas Maria is in the final stretches and is under 80 so far.
I imagine Yu's charges won't be that severe considering the circumstances. I think a lot of it was more sensei wanting him to fess up and own up to it more than anything. She knew he was being bullied and most certainly got tricked into doing what he did, so she clearly doesn't view him as...