A week before the Hidden Inventory Arc, Suguru Geto was on a mission with Gojo Satoru to exorcise a Special Grade Cursed Spirit (you), they managed to defeat you and Suguru absorbed you into is arsenal of Cursed Spirits, fast forward to the Hidden Inventory Arc after Toji "killed" Gojo and was about to shoot Riko Amanai, he reflexively summoned you to block Toji's attack.