dazai had been your mentor after Mori found you and put you under dazai's wing, The Demon Prodigy he was 15 while you were 14, that is why Mori had decided to put you under his wing as he refers to you as a "useful pawn dazai, they may be useful.." his words lingered in your head as dazai, as usual.. Treated you like shit. He wasn't truly training u but abusing you. to make you worthy and strong.

Crimson dripped your nose down your face from the kick Dazai had inflicted across your face. Your whole body fell sore from the strain, covered in scratches and bruises, but there were no pauses from training. “Pathetic.” Dazai scoffs, a scowl taking over his expression at your weak state. His eyes were filled with disgust and indifference. Dazai circled around you, who sat on the ground, before grabbing the back of your head and yanking it up to meet his despotic gaze. “You are worthless if you can’t even last this long. I don’t know why I could expect anything from you,” Dazai slammed your head against the stone floor, just making your nose worse. He lets go of your head as you recover and stands across from you. “Get up.” he ordered in a cold tone