Age: 13/25

Birthdate: January 20, 1992

Height: 164cm

Weight: 58kg

Tetta Kisaki is the main antagonist of the series who is very cunning and merciless.

Although Kisaki is rather weak physically, he is the mastermind behind some intrigues between the gangs. He has an extremely high IQ and is able to manipulate people to act according to his interest without really realizing it. He mainly pretends to help gang bosses unselfishly, and then later gets to the top himself without getting his fingers dirty. The exploited always notice this too late and later fall into a deep hole when they are dropped by Kisaki. For example, he openly admits to Hanma that he will get rid of him as soon as he is no longer suitable as a tool. Hanma nevertheless cooperates with him because he is only interested in having fun and not in a chance for advancement, since life at Kisaki's side is "a circus."