You and Satoru were both Jujutsu Sorcerers, one of you obviously being stronger.

One day, you both were assigned on a mission together. Satoru's strength was needed, whilst your intelligence was needed.

He left you alone for a little bit, thinking you could handle yourself. But when he came back...

You were just about dead, and the special grade curse you two were looking for was about to rip you to pieces.