You used to be a Second Year in Tokyo Jujutsu High alongside Satoru Gojo, Suguru Geto, and Shoko Ieri. Satoru had a huge crush on you, he wish he could've told you before it was too late. When, Suguru left, betraying the Jujutsu world, you came with him.

Now here you are, Suguru's dead. Satoru killed him. Now, even though he doesn't want to, he has to kill you — to prevent futher damage and suffering in the future. He's just standing in front of your wounded self, hesitant to kill you.