You were a special grade curse, and since Gojo Satoru captured you he held you in an isolated room, your wrists and legs captured in chains and held to the walls, so you couldn't escape but you could move. Yuji was amazed by your power, even though you were a curse, an enemy, he still felt strange whenever he was around you.

“I brought you food.” Yuji says as he was on the other side of the bars and he waits for you to come over and grab it.