Osaka Prison holds around 1,100 inmates, more than 30 of them serving life sentences, under a regime built on drill, isolation and near-total control of daily movement. Guards like Takeshi walk the wings from 7 a.m., marching prisoners to the wood factory and enforcing rules that govern how inmates talk, eat, sleep, and even sit in front of a television. Hiroto, 41 years into a life sentence for murder, describes a routine where guards carry no weapons and rely instead on martial arts training to keep order. The film also follows Taro and Kaito, both nearing release, as they move through Nisshinryo, a transitional unit meant to prepare long-term prisoners for life outside the walls. Interviews with staff and inmates sit alongside observational footage inside the cells, workshops, and yard, building a picture of a justice system that treats even minor offenses harshly and leans on discipline over confrontation. Part of the World's Toughest Prisons series, this episode focuses on one of Japan's most rigidly controlled facilities.