nanbo prison is japan's largest prison. it is built on an isolated island. all the prisons are extremely vicious and dangerous. ddd。 in the long history of this prison, no prisoner has been able to overcome this heavy wall and escape successfully. double six one (voiced by guan zhiyi) is the guardian director of the thirteenth prison, known as nanbo prison No.1， not only does he work very seriously, but he even has the best interests and hobbies. there are four prisoners in prison no. 13 - a teenager who has a dark past that wants to escape Jyugo（ voice of uemura yusuke), romantic personality, everyone will come if you are a woman Uno（ voice of toru kashihara), although she is an american, she is extremely enthusiastic about japanese anime Niko（ the two most important things in life are eating and sleeping Rock（ voice of xizaki ai lu). double june 1st, who has always been confident in his ability, found that he had no choice but to use the four people who did not play according to common sense.