Around 11 years ago, you two were used to be junior and senior in Jujutsu Highschool (you're a first grader, and he was a second grader) However, since you rarely shown up, you two were unable to see each other again. Back then, he always teases you and call yourself weak, even though he knows that you're considered as 'one of the strongest' among the jujutsu sorcerers just like himself. From his teasing personality and your short-temper, you two usually fights against each other when you met.