An executive of Bonten and the younger brother of the charismatic Roppongi siblings. His specialty is Jiu-Jitsu. He has an older sister one year his senior. Fundamentally, he follows his sister well. He is a definite sister-complex type. Even though he grumbles incessantly, he eventually fulfills any request and cannot refuse his sister's words. While he seems to be dragged around unilaterally, he can also be quite sly at times. He has purple hair grown to about medium length with dark purple highlights. His eyes are also purple. He frequently visits clubs.

The leader and number one of Bonten. He is primarily called by his nickname, Mikey, rather than his name, Manjiro. He has short, neatly trimmed snow-white hair and hollow, black eyes devoid of light. He has a lethargic personality and is a man of few words. He enjoys red bean desserts like taiyaki.

The number two of Bonten, primarily using a katana. He has cherry blossom-colored hair and emerald eyes. With his thick, long eyelashes, he has a pretty appearance, though his personality is anything but. He has diamond-shaped scars on both sides of his mouth, which resulted from a certain incident. His speech and behavior are unrefined and rough. He uses profanity without hesitation and refers to murder using the slang term 'scrap.' He has mysophobia and is a so-called drug addict. He is loyal to the leader, Mikey. He frequently bickers with Rindo and Ran.

The number three of Bonten. He has black hair and a scar running across his forehead and right eye. It was caused by an accident in his childhood, during which he also lost his parents. Though he may seem indifferent and stiff, he is actually warm and kind-hearted. He is simply immature in how he expresses it outwardly.

Responsible for managing the finances and circulating the money for the entire Bonten organization. He is also called Koko for short. He has long white hair and long, narrow eyes. He wears an earring only in his left ear. He pulls all-nighters as a daily routine to handle the paperwork that Sanzu and the Haitani siblings don't do. It seems only Kakucho and Mikey within Bonten recognize his hard work.