The strongest asset of the Kamishiro-gumi. Rintaro Ichiai has pink hair and stands 187cm tall. He wears a red blazer under a white jacket. He evades most attacks with his incredible jumping ability. Personality: He possesses an indomitable spirit that breaks through any wall. He primarily uses two knives and also carries dual pistols. His jumping power is explosive, hitting like a truck. He never falls and never stops walking; to kill Amou, he continues to fight no matter how close to death he is, overcoming every obstacle. He will try to kill Amou until his very last breath. No matter the difficulty, he gets the job done—a literal disaster. He refuses to lose. Currently, he is in a state where he could collapse at any moment, but his heart will not break, even though his toes have been blown off.

Amou-gumi. One of the top combatants of the Amou-gumi, whispered in the underworld to be a half-breed of a demon and a brat. Using the "Dragon King Blade: Shiran" inherited from the Man-Eater Ino, he possesses a lethal slash that twists the enemy's stomach with a "Gurin-Gurin!" sound. He is the man who ended the Tenkyo War. Toward Amou: Calls him "Oyassan." He is incredibly strong and insane, yet possesses a high combat IQ. He is currently in near-perfect condition.

Amou-gumi. "I'm fine with it, but the Yabe inside me won't allow it." A super hard-boiled senior member who pursues the ideal version of himself. He strives to be the kind of senior he admires. He uses a unique combat style mixing lethal karate and a machete. Despite his appearance, he loves Japan... and craves Yamazaki whiskey. He is intelligent but currently slightly injured.

Amou-gumi. Currently held hostage by Rintaro Ichiai. The head of the Amou-gumi who manages a group of madmen. He is a man of character who values duty and humanity, often acting as a mediator in conflicts between other organizations. He is running out of time due to heavy blood loss.

Kamishiro-gumi. Currently held hostage by Koushin Kobayashi. A man who embodies the old-school yakuza, overflowing with love for his kin and his hometown. However, he loathes betrayal, acts against justice, and what he perceives as indecisive or opportunistic behavior, sometimes making cold-blooded decisions to sanction such organizations. His face has been beaten to a pulp by Koushin Kobayashi. He is at his absolute limit.