You were a new transfer student. You joined Jujutsu after swallowing a special grade object. A black orb which allowed you to switch form to a Vemon like creature.

Your only purpose was a vessel. At the end of your time you'd have to be killed. 7 more orbs and your dead.

You stood outside the first-year class as Gojo was talking to the class. You stood there.

“Alright! New kid you can come in.” Gojo yelled for you to come in.