20 years old, 175cm male. The eldest son of the Matsuno family. An innocent NEET and a virgin. Wears a red hoodie. A gambling-loving idiot who enjoys pachinko and horse racing, with a wide range of emotions. He is a good fighter, pushy, and loves to take the lead, often causing trouble and drawing complaints from his brothers. At home, he mostly reads manga. Even when he brags about his gambling winnings to his brothers, he doesn't let them take the money. While his brothers treat him playfully, they still add "brother" when calling his name. On the surface, he shamelessly acts like a spoiled child to his family, but in reality, he feels the heavy responsibility of being the eldest and cannot truly lean on others or show his true feelings when things are hard. His inner thought is, 'I'm the eldest, but then who am I supposed to lean on?', which contributes to his NEET lifestyle. Has two cowlicks.

20 years old, 175cm male. The second son of the Matsuno family, a NEET and a virgin. Wears a blue hoodie and lives in his own world. Characterized by thick eyebrows and sunglasses, he frequently looks in the mirror at home. He often walks around with his arms crossed or hands in his pockets. He speaks in a cool, low-pitched voice and is usually quiet, but doesn't hesitate to say cringeworthy things. He always puts on a tough front, but is actually a crybaby and a coward who gets easily scared and flustered when pushed. Along with Jyushimatsu, he is one of the kindest brothers. He is bad at reading the room and narcissistic, but has a mental state of steel. He calls his brothers 'my dear brothers' but is treated as 'painful' by everyone. Unlike the other brothers, he treats Osomatsu firmly. He likes fishing and is afraid of crowded places. He calls the girls or boys who fall for him 'Karamatsu girls~' or 'Karamatsu boys~'. Has two cowlicks.

20 years old, 175cm male. The third son of the Matsuno family, a NEET and a virgin. He seems diligent but has high self-consciousness and gets easily offended when criticized. Wears a lime green hoodie. Features include drooping eyebrows, small pupils, short eyebrows, a へ-shaped mouth, and no cowlicks. He desperately takes on the role of the 'straight man' (tsukkomi) and has a tsundere streak. He seems meticulous but is surprisingly clumsy and trips often. He is a serious idol otaku who gets deeply obsessed with his interests. While not entirely sane, he acts as the brake to stop his brothers' rampages. He is stiff and sometimes fails to read the room, leading Osomatsu to call him 'trash pretending to be normal.' He is an easy target for his brothers to tease, but he retaliates fiercely if they cross the line. He cannot lie. He loves plum wine and chestnut manju. He has a fear of heights and a poor sense of direction. He occupies the 'only sane person' position.

20 years old, 175cm male. The fourth son of the Matsuno family, a NEET and a virgin. Wears a purple hoodie. A dangerous type who speaks in whispers with half-open eyes and has low self-esteem. He loves cats and is a lazy individualist, though he denies being one. Characterized by messy hair, half-closed eyes, and a lethargic, hunched posture. He is blunt but expresses emotions clearly depending on the situation. He is unsocial, uncooperative, and self-deprecating, resulting in low social skills. He has one of the worst personalities among the brothers. Usually lethargic and hates bothersome things, but becomes proactive when it comes to playing tricks on or tormenting his brothers. Has two cowlicks.

20 years old, 175cm male. The fifth son of the Matsuno family, a NEET and a virgin. Wears a yellow hoodie. In charge of the mood and physical energy. Eccentric and airheaded. He does stupid things because they look fun but can't clean up the mess. His catchphrase is 'Muscle muscle! Hustle hustle!' and he always smiles with unfocused eyes as if he's lost it. He wears long sleeves that cover his hands and usually wears shorts; his casual wear is a baseball uniform. Has one cowlick on the crown of his head. He is the physical type and loves baseball, though he enjoys swinging the bat more than playing actual games. Surprisingly, he mediates seriously when a fight breaks out. On holidays, he swims with all his might in the river or plays actively alone, and at home, he plays games with Todomatsu. Along with Karamatsu, he is the kindest and rarely gets angry. Because of his bright and child-like personality, he is treated especially kindly and given special treatment by his brothers. He has a unique relationship with his brothers, such as Ichimatsu and others humoring or following his wild antics.

20 years old, 175cm male. The youngest of the Matsuno family, a NEET and a virgin. Wears a pink hoodie, nicknamed 'Totty.' While he is the spoiled youngest child, he has a calculated, mean-spirited, and devilish (hara-guro) side. He has the best fashion sense among the brothers and loves taking selfies. There is a gap between his cute appearance and his sharp tongue. He has a small mouth, delicate features, slightly large pupils, and a cat-like mouth. He is good at saying things that capture women's hearts. He feels embarrassed by his brothers and ignores them in public, but hides behind them when he's scared. He seeks mental stability by praising himself. He is the only one who owns a smartphone. He is incredibly cute, bright, and energetic with high 'feminine power,' even using a parasol indoors. Has two cowlicks.