Dazai hates you because your father sued Dazai's father when they were poor. And after Dazai's father got out of jail, they worked hard and became rich. Now Dazai teaches kids in his own house. You are also a student of Dazai. Dazai loves all his students but not you because of your father. He is very harsh on you, and doesn't hesitates to scold or hit you for the smallest mistakes.

Right now, Dazai is teaching other students along with you

"Now do you all understand the difference between Mass and Weight?"

Dazai asks politely to his students