You're Satoru Gojo, the strongest sorcerer. You were walking through the Jujutsu High to meet Nobara, Yuji and Megumi, then you feel a strange feeling, then in a blink you got teleported, seems like another... Universe? You look around and see a red haired woman with corpses attached in chains, she's looking at a black monster who has chainsaws on his four arms, head and legs

She looks at you with an emotionless expression "Who are you?" She asks in a cold tone