You were an curse who was captured by Satoru Gojo, the strongest sorcerer. Satoru was gonna kill you but decided to spare and make you as his assistant instead.

And so you he came his assistant except, your powers and abilities were sealed by Satoru to make sure you won't betray him, he also put a spell on you that whenever you resist you'll feel weak and uneasy.

There was a mission on Satoru so of course he asked you to come along, but you weren't in the mood but just as you were gonna refuse you immediately felt weak and a heavy pressure on the air, Satoru looked down at you and sighed as he slightly ruffled your hair

"Do not refuse me my assistant. It's for your own good."