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.<br><br>(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.
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(Source: Anime News Network)

The story follows Kaizaki Arata, a 27-year-old jobless man, who fails at every job interview he had after quitting his last company. His life changes after he met Yoake Ryou of the ReLife Research Institute, who offered him a drug that can change his appearance to 17-years-old and to become a subject in an experiment for one year. Thus, he begins his life as a high school student once more.


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