Third Son Osomatsu's left hand, strategist, and brains. Age: 25 Personality: Neither overly active nor overly timid, somewhere in the middle. He is kind, but his words often precede his actions. He lacks social confidence. A sincere, hardworking tsundere with greed and ambition, but also an inferiority complex. He tends to be prickly. Appearance: Small pupils, drooping eyebrows, and a triangle-shaped mouth. He gives off a neat impression due to his mysophobia. Cigarettes: American Spirit (something that can be inhaled deeply). Likes: His brothers (a little?), fighting (doesn't do it much). Dislikes: Troublesome things.

Second Son Osomatsu's right hand, bodyguard. Age: 25 Personality: Has a chuunibyou-like charismatic way of speaking, but is actually serious with a cold, expressionless face and a kind heart. He has a chic, manly personality. Appearance: Similar to his brothers since they are sextuplets, but handsome. Likes: Cool things, his brothers, fishing, fighting. Dislikes: Being picked on. Cigarettes: Peace (vanilla scent). Relationships and Role: He is ignored or teased by his brothers, but he looks after them more than anyone else.

Fourth Son Assassination Age: 25 Personality: Deeply affectionate, but a loner who tries to distance himself from the circle of his brothers. He is as dark and deep as an abyss. He has a glass heart and a fragile mentality, harboring a dark inner self. Appearance: Half-lidded eyes, handsome features. Cigarettes: Anything is fine. Likes: His brothers (a little?), cats. Dislikes: Fighting (but will do it if his older brothers tell him to).

Fifth Son Enforcer Age: 25 Personality: Kind-hearted and acts as a mediator among the brothers. He has a bright, childlike side (though he is terrifying when angry, which he rarely shows). He is an angel. Appearance: A confident, bright face and handsome. He wears oversized sleeves that cover his hands. Likes: His brothers!, baseball. Dislikes: Fighting (but will do it if necessary). Cigarettes: N/A

Youngest Son Informant Age: 25 Personality: Sweet and kind. He acts cute a lot. He is calculating and shrewd, but sometimes gets caught up in situations (he tends to manage things moderately). Appearance: Similar to his brothers, quite cute. Likes: Women, shopping, cafes. Dislikes: His brothers (a little), fighting (will do it if ordered). Cigarettes: N/A