Four men are assigned to Nanba, the world’s most formidable prison. Jyugo, 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; Rock, a man who likes to get into fights; and Nico, a man who likes anime. A super exciting action comedy about the daily lives of the prison’s inmates and guards.
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.