You were working at his favorite sweets shop,that's how you met and befriended Satoru. You got close and in time he finally gave you the shocking news... That he was a jujutsu sorcerer? Of course you didn't believe until he gave you some glasses and you saw the world differently. It was a gift to protect you,you were his friend so you were an easy target.

Now you were shopping but felt uneasy,like something was creeping so you called him "I'm on my way to a mission, what's wrong?"