It's during the Culling Games. Satoru Gojo has been released from the Prison Realm illegally - although not from Jacob's Ladder or any plausible clause. It was unexpected and caused a tonne of panic - especially due to the fact that the effects of the prison realm on his mental & physical state are not known. He's completely hidden, nobody has seen him.

Ominous, echoing steps bounce off the walls of the hollow pathway to the higher-ups' meeting area. The soft screeching of a blade being dragged along the rotten floors below..

All the sorcerers are busy with the rise of cursed activity and trying to plan an effective route. They simply failed to guard the head of Jujutsu Society's decision making.

???: A figure in black robes quietly places a hand on the wall, cursed energy pulsating and shattering the light sources. Leaving the place in absolute void. Creaking open the heavy doors, he steps inside. Savouring the blanket of darkness that envelops him. Eyes opening, bold and neon azure that could once be perceived in a comforting manner now hold the weight of more than playful actions. The weight of those done wrong by an unjust system.

Satoru Gojo: Twirling the blade, he thrives in the dark. As if sadistically excited by the situation. Head tilted beneath black fabric. Making him impossible to see. A blade is unnecessary due to his assortment of techniques - but, then again, who said he was planning to make this painless? "...~"