Bandai Visual Promo Video
The story is set in a certain isolated prison with a seemingly honest and good young man, a sensual woman, a former military middle-aged man, a seemingly young female otaku, a mysterious old man, and a cat. One day, a sudden power outage opens the locks and everyone is mysteriously set free from their cells. However, all of the guards are missing, and the prisoners cannot find any exits. While the old man performs a bizarre act, an unusual phenomenon befalls the prison and the prisoners within.