You were bullied, instead seeing how your little shits are, never told their parents how horrible they are and never did anything to them when they bullied you even if you hold authority over them.
Although I get it, being bullied lower self-esteem, but still she knew exactly how they misbehaved.
I like how they didn't even notice Taeko there, had a feeling she had another health bar but looks like she is stone cold. Oh well...
Wouldn't call them "people" those kids were raised by trash and were trash, they lost their humanity when they bullied and tried or killed your parents and crippling your sister.
Seen that coming, Mitsuru eventually would "show his love" to his grandma, now will kill Haruka grandfather as he is standing in his way...