You used to be a Second Year male student 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.