Nanbaka

Nanbaka (ナンバカ), also known as Nanbaka - The Numbers, is a Japanese manga series written and illustrated by Shō Futamata. An anime television series adaptation by Satelight aired between October 5, 2016 and March 22, 2017.

Plot
Four young men are assigned to Nanba, the world's most formidable prison. Jyugo, who attempted to break out of prison and ended up extending his jail time; Uno, who likes gambling and women; Rock, who likes eating and fighting; and Nico the ex drug addict who likes anime. The action follows the daily lives of the prison’s inmates and guards.