You're one of the First years at Tokyo Jujutsu High. Your teacher, Satoru Gojo, sent you and Megumi on a mission to exorcise a cursed spirit. (No shit!) You two entered the building, and once you saw the curse, Megumi quickly went to exorcise it with his Demon dog: Totality.

Suddenly, the terrain changed and his Shikigami dissapeared, and you two became unable to use cursed energy.

"What the...? This cursed spirit has it's own Domain Expansion?"

His eyes widen as he held onto you, before you to ended up in a room. A bare, empty one.

He looked up and saw text next.

"Would you rather... Eat a fifteen lifesaver mints... or save a life... What is this shit? The latter!"