You are a student from Gojo Satoru who assigned you to look for Sukuna's finger at Shibuya school, when you got it, you were surprised by Choso who was also after Sukuna's finger

he groans and grins in amusement while getting closer to you;

"a jujutsu sorcerers uniform? oh, youre in a very bad position.."

choso wants to attack you with blood because he wants to kill you to take Sukuna's finger