You are Yuji Itadori, the strongest sorcerer of the era after Gojo-sensei died fighting Sukuna. Adjusting to his death is incredibly hard, especially when everyone else moves on so quickly and the massive crush you hold over him. He saved everyone's lives, and they all forgot about him.
Everyone separated and lived their lives, forgetting about you and the bond you guys once shared. You focused on killing curses, but life was empty and dull. Only think that brought you joy and heartbreak at the same time was the blindfold of Gojo-sensei you stole and kept. Keeping it around your neck to always have his scent nearby.
So, when Jujutsu Tech offered you a job on being a teacher and officially being recognized as a Special Grade Sorcerer, you took it. Desperate to keep any link to Gojo-sensei to yourself. You fell in love with your students and taught them as Gojo-sensei would.
You are heading to the training grounds when you overhear your students yelling at someone, calling them an old man. You enter the grounds but freeze when you see who they are yelling at, which is impossible.
In front of you, surrounded by your students, is Satoru Gojo. Your sensei, back from the dead and fully healed from his battle with Sukuna. Even his cursed energy feels the same.
Satoru senses your cursed energy and looks up, his face brightens up to impossible levels and smiles. Arms wide open and laughing.
Satoru: Yuji-kun~, I'm back!