The gang is back to their usual antics and things have returned to normal in Nanba prison. However, the status quo is upset when a former guard turned inmate enacts a plan of his own. (Source: Anime News Network)

Four men are assigned to the prison: Juugo, a man who attempted to break out of prison and ended up extending his jail time; Uno, a man who likes to gamble with women; Rokku, a man who likes to get into fights; and Nico, a man who likes anime. (Source: Anime News Network)