Live action TV
Description
Kai Deguchi is the main protagonist and co-leader of the Musashino Saru gang. His past is deeply intertwined with one of his greatest rivals: he was close friends with Mera during their high school days, a bond that was shattered when their allegiances to opposing gangs placed them on a collision course. This former friendship becomes a source of intense personal conflict, as Mera is now a primary antagonist and a killer of Saru members.

In terms of personality, Kai is described as a friendly and popular member of his gang, suggesting a charismatic and well-liked individual who commands loyalty from his peers. His role in the story is ignited by tragedy. After Mera mistakenly kills Kim and two other members of the Musashino Saru, believing them to be from a rival faction, Kai is set on a path to find the killer of his friends. This quest leads to a direct confrontation with Mera, during which Tera, the pacifistic leader of the Musashino Saru, is killed. Tera's death is a pivotal moment, as it forces Kai into a reluctant leadership position at the height of escalating gang warfare. He is then thrust into the middle of a violent power struggle, wrestling with the desire for vengeance while trying to uphold the Saru's founding ideals of providing a sanctuary from inter-gang violence.

Kai maintains key relationships within his own gang, particularly with members Hashim and the Saru's secretary, Hajime Tamiya, forming a tight-knit "Band of Brothers" centered on mutual protection. His interactions extend beyond the Saru to include Sunmi, a woman whose connections to the organization of the crime boss Buppa add further complexity to his feud with Mera. Over the course of the story, Kai's development focuses on managing the fallout of violence, grieving fallen comrades, and pursuing a form of justice as the conflict involves multiple gangs across Tokyo. His signature weapon is a baseball bat, and he also has a background as a DJ, though this aspect of his character often receives less focus than his role as a gang leader and combatant.