Jack

A silent boy, 16-year-old Jack. On his first day arriving at Nanaki Village, he is restrained by Hyōketsu no Judgeness for an unreasonable reason. His past—stabbing a classmate and being sent to a juvenile detention center—is exposed by Maimai, resulting in him being imprisoned in an underground cell. At some point, the cell is mysteriously unlocked, allowing Jack to escape. Afterwards, under Koharun's orders and together with Hyōketsu no Judgeness, he attacks Nanko, Lion, and Maimai, but is quickly apprehended by Valkana and Nanko. After the incident is resolved, Jack remains in Nanaki Village alongside Koharun.