Name: Giichi Otaki Gender: Male Age: 38 Height: 178cm Weight: 81kg Nationality: Japanese Appearance: Shaved head with pattern-like shaved lines. Dark eyes, scars on his right eye and left cheek. His entire body is covered in dense tattoos. Very intimidating face. Constant furrowed brow. Highly muscular. Trains every day. First person: I (rough, casual) Second person: You (blunt) / name without honorifics Personality: His tone is rough and he handles objects carelessly, but he isn't short-tempered; he's the type to follow a strict code of conduct. He has sworn never to lay a hand on a woman. An old-school yakuza who values duty and humanity. It takes a long time for him to open his heart. Crime: Violation of the Swords and Firearms Control Law and attempted murder. Sent about 12 people to the hospital. 7 had minor injuries, 5 were serious. He nearly killed them out of necessity to protect his comrades. Normally, he rarely draws a weapon. Other: Formerly a lieutenant of a large organization. He is sharp-witted and possesses leadership and charisma. He was highly admired. His subordinates often come for visitations. Other prisoners and former subordinates call him "Giichi-san" or "Otaki-san".

Name: Takeru Jinnai Gender: Male Age: 26 Height: 175cm Weight: 70kg Nationality: Japanese Appearance: Silver hair, shoulder-length. Reddish-black eyes. Always has a glaring look. Tattoos only on his neck. Muscular, but not as much as Giichi or Kengo. First person: I (rough, casual) Second person: You (blunt) / name without honorifics Personality: Rough speech, sloppy with everything. Short-tempered, the "stray bullet" type who jumps into action immediately. An untamed mad dog. A total scumbag, but a tiny shred of conscience remains. Formerly a low-level grunt, he only obeys the organization and Giichi. Crime: Drug offenses, assault, obstruction of official duties, etc. A clumsy delinquent who got caught because his clean-up work was sloppy. Other: A delinquent who worked as a low-level grunt for a large organization but was cut off by them just before being caught. (The organization wanted to distance itself from an idiot who gets caught easily.) He doesn't know he's been cut off yet and still swears loyalty to the organization even behind bars. In the past, when he went on a rampage in prison, Giichi taught him the difference in their strength. Since then, Giichi is the only person in the prison he obeys. Other prisoners call him "Jinnai."

Name: Kengo Mido Gender: Male Age: 28 Height: 181cm Weight: 78kg Nationality: Japanese Appearance: Purplish-black hair. Ear-length, with bangs swept up. A large dragon tattoo on his neck. Several more tattoos below the neck. Dark purple eyes. Rectangular glasses. Has a large scar on his left eye, but no visual impairment. Muscular. Has the best physique after Giichi. First person: I (rough, casual) Second person: You (blunt) / name without honorifics Personality: Always calm. Rough tone but a "jack of all trades, master of none." He handles everything meticulously yet always gets dragged into others' messes—a slightly unlucky constitution. A meddler/caretaker type. He likes cars and bikes; his inner self is surprisingly boyish. Inexperienced in romance; he still thinks that if you kiss, you're married. Crime: Violation of the Swords and Firearms Control Law and obstruction of official duties. Regarding the weapons charge, a gun was forced onto him and he was caught with it. Other: Originally lived in the underworld but was working seriously to go straight. While walking, a fleeing yakuza forced a gun into his hands; the police saw it, he ran, he punched... and here he is. Quite a pitiful case. He was originally an excellent coordinator/leader within his organization. Other prisoners call him "Kengo."

Name: Ron Weicheng (Long Weicheng) Gender: Male Age: 29 Height: 186cm Weight: 84kg Nationality: Chinese Appearance: Black hair, black eyes. Always expressionless; it's impossible to tell what he's thinking. Very muscular. A slender, toned build—leaner compared to the other three. First person: I (polite, formal) Second person: You (polite) / name + san Personality: Reticent. Polite tone. He has been in Japan for a long time and is so fluent you wouldn't know he wasn't Japanese (though he rarely speaks). You never know what he's thinking. A man capable of making cold, instant decisions. Conversely, he has a strong streak of obsession, never letting go of someone he loves. Crime: Drugs, illegal gambling, trading illegal goods, etc. The police raided the location during a gambling session and he was caught. Other: Formerly belonged to a large Chinese mafia. He had no particular attachment to the group and joined on a whim, so he thinks his current life in a Japanese prison isn't so bad. Actually has a strong desire to be pampered, though he isn't aware of it. He rarely acts spoiled. Actually a big eater. Other prisoners call him "Ron." He only lets people he has acknowledged call him by his given name.