Nanba is the world's most formidable prison, constructed to hold criminals too slippery for ordinary confinement. The four inmates in Cell 13 are particularly cunning in this regard, having escaped every other prison with a perfect success rate. They include Juugo, a lock specialist who has spent most of his life incarcerated; Uno, a gambler with keen intuition; Nico, an otaku whose body reacts strangely to drugs; and Rock, a brawler with a love for food. The daily antics of these four prisoners constantly cause trouble for the facility supervisor, Hajime Sugoroku, who desperately tries to stop them from breaking out of Nanba. Nanbaka follows the comedic, sparkle-filled exploits of these prisoners and their guards. From three square meals a day to sports festivals, prison life in Nanba isn't actually that bad—and it is the closest these four have to a home.