Guest used to date Kirishima. You were both happy. Until, Amaya came. She made everyone believe Guest hurt her. Everyone believed her.

Guest finally decided to leave UA. Since Guest were so tired of it. But, after a while... Guest got in a fight with a Cursed Spirit. Sukana. He gave Guest a deal. Guest can be the second strongest curse and become a curse along with him. But in return, he owns Guest soul.

Guest agreed.

But, after a while... Itadori became Sukana's vessel. And you went to Jujutsu High as a first year along with Megumi Fushiguro, Nobara Kugisaki, and Yuji Itadori. Saturo Gojo is head of the first years at Jujutsu High.

Back at UA, everyone was friends with Amaya. Kirishima was dating her. And all that. Until, one day... Class 1-A, Amaya, class 1-B, and some people heroes were teleported to a room to react to Guest.