Shūjin RikuShūjin Riku.

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.