Four inmates recklessly attempt to escape from the world’s best prison guards and security: Jyugo, who wears mysterious shackles, Uno, a self-proclaimed ladies’ man, Nico, an otaku who’s prone to illness and Rock, a foodie gang member.

The inmates in Cell 13; Jyugo, Uno, Nico, and Rock are spending their days escaping, creating mischief, gossiping, and sometimes, working. These troublemakers are giving a headache to supervisor of Bldg. 13, Hajime Sugoroku.

Jyugo and the gang are killing time teasing the new guard. One day, a new inmate is sent to Cell 13 - Inmate Number 99, Tsukumo. He looks and acts like a ninja, but not everyone is buying it.

Nanba's New Year’s Tournament begins by gathering all of the inmates together, but all of the matches are odd events relating to New Year’s. Can Building 13 win against the other inmates led by peculiar guards?

Jyugo and the gang are advancing through the New Year’s Tournament without a hitch. In the Hyakunin Isshu event, Uno wins against the Building 3 inmates, Trois and Honey. The 4th event is a physical match revolved around a spinning top.

Cell 13 has advanced their way to the final event of the New Year’s Tournament. Jyugo and Hajime are battling against the Building 4 supervisor, Kenshirou Yozakura, and an inmate named Musashi.