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Shūjin Riku
	First tankōbon volume cover, featuring Riku Kurita
囚人リク
Genre	Prison
Manga
Written by	Shinobu Seguchi
Published by	Akita Shoten
Magazine	Weekly Shōnen Champion
Demographic	Shōnen
Original run	February 10, 2011 – February 15, 2018
Volumes	38
Manga
Boss Renoma: Shūjin Riku Gaiden
Written by	Shinobu Seguchi
Published by	Akita Shoten
Magazine	Weekly Shōnen Champion
Demographic	Shōnen
Original run	August 30, 2018 – January 10, 2019
Volumes	2

Shūjin Riku (囚人リク) is a Japanese manga series written and illustrated by Shinobu Seguchi. It was serialized in Akita Shoten's shōnen manga magazine Weekly Shōnen Champion from February 2011 to February 2018, with its chapters collected in 38 tankōbon volumes. The story follows Riku Kurita, a 13-year-old boy from the slums, witnesses the assassination of an old police officer wanting to denounce the Tokyo police chief's countless trafficking activities. The latter accuses Riku of the murder and sends him to a prison on an island isolated from the rest of the country, the Paradise Island Penitentiary.

Plot

One night, a meteorite crashed into the city of Tokyo. Ten years later, the destroyed Tokyo was undergoing reconstruction, but the area around the meteorite crater was left behind and turned into a slum area with extremely poor public safety. As a result, the megacity is cut in two, the affected area is a slum isolated from the rest of the country, and the rest of the city is reserved for rich people of the society. The slums were isolated by walls, and security was maintained even more strictly than in the outside. Riku Kurita, a boy orphaned by the meteorite crash, lives his days in the slums under the watchful eye of Goro Fujimoto, a middle-aged police officer whom he adores as his uncle. However, on July 8, in the 10th area of the slums, Fujimoto was killed while trying to expose the evil deeds of Eishu Kidoin, the police inspector general. Riku, who was present at the scene, was charged with murdering Fujimoto, he was imprisoned in Paradise Island Penitentiary. In order to defeat Kidouin and avenge his uncle's death, Riku decides to escape from prison with his friends. After much effort, he gathers his friends and manages to escape from the prison of the Island, but the group falls into Kidoin's hands and is sent to Kidoin's illegal facility, Hell Island on Jigokujima, where huge mine shafts were dug underground, and opium was cultivated and manufactured above ground. The group attempts to escape again under harsh conditions, with most of the prisoners being sent to die within a month.

Publication

Shūjin Riku, written and illustrated by Shinobu Seguchi, was serialized in Akita Shoten's shōnen manga magazine Weekly Shōnen Champion from February 10, 2011,^[2] to February 15, 2018.^[3] Akita Shoten collected its chapters in thirty-eight tankōbon volumes, released from June 8, 2011,^[4] to April 6, 2018.^[5]

A gaiden story, titled Boss Renoma: Shūjin Riku Gaiden (ボスレノマ～「囚人リク」外伝～, Bosu Renoma Shūjin Riku Gaiden), was serialized in the same magazine from August 30, 2018,^[6] to January 10, 2019.^[7] Akita Shoten collected its chapters in two volumes, released on January 8 and March 8, 2019.^[8]^[9]