Shigoku Kyou is the main antagonist in Jūjika no Rokunin, emerging as the sadistic ringleader of a group of bullies. A brilliant, psychopathic genius—ace student, black belt in judo—he becomes obsessed with tormenting Shun Uruma. Kyou orchestrates the murder of Uruma’s family and physical harm to his brother, all as a twisted “experiment” to push Shun to suicide. Post-time skip, he reforms his influence into a cult-like “Revolution Club,” wielding mass brainwashing, torture, and murder.