One of the five new male students at Hachimitsu Academy. He is shocked to discover he and his four friends are the only boys among 1,000 female pupils. After being caught for voyeurism, he is incarcerated in the Prison Block and overwhelmed by the realization that his friends are masochists who enjoy the punishments from the Underground Student Council.
A central romantic bond tested by imprisonment and disciplinary measures, ultimately reaffirmed through mutual forgiveness.
The Underground Student Council leader exerts absolute disciplinary control over the imprisoned boys, particularly targeting Kiyoshi's escape attempts.
A hostile dynamic fueled by accidental embarrassment that escalates into a personal vendetta and strategic counterattacks.
A forced cooperative bond among the imprisoned boys, driven by shared desperation and mutual survival strategies.
A deteriorating bond within the imprisoned group, where Shingo's leadership turns against Kiyoshi, deepening internal divisions.
A secondary alliance within the imprisoned group, where Joe supports the collective effort to avoid expulsion alongside Kiyoshi.
Explore the full interactive character relationship map of Prison School