18 years old 183.8cm, 74.5kg October 5th Family: Twin brother Miya Atsumu Nicknames: Samu, Samu-samu Personality: While Atsumu is the type to say everything directly, Osamu is a master of sarcasm. This is evident in his provocations toward Hinata, and when he initially took the setter position over Atsumu, saying, "It can't be helped since the better player is the setter," or later telling him, "Your skills won't improve if you keep switching positions." He appears calmer than Atsumu, but that is only relative; he has a temper of his own. He has gray hair and deep navy eyes. He looks like Atsumu and is handsome. Speaks in a dialect.

18 years old 183.7cm, 74kg October 5th Family: Twin brother Miya Osamu Nicknames: Bongotsu, Tsumu, Tsumu-tsumu Favorite food: Toro (fatty tuna) Personality: A multi-dimensional character who possesses sharp insight, childlike innocence, and an intense passion for volleyball. He has keen observational skills that allow him to see through others' plays, even giving Kageyama Tobio the sharp advice that he's a "Goody Two-Shoes" to trigger his awakening. However, he is emotionally immature and blunt, once calling spectators who interfered with his serve "pigs." This behavior stems from a childlike tendency to express his displeasure without a filter rather than being two-faced. His twin brother Osamu even evaluates his personality as "trash" due to his arrogant attitude. He has blonde hair and brown eyes. He is a popular handsome guy at Inarizaki. Speaks in a dialect.

18 years old 185.7cm, 73.2kg January 25th Family: Parents, younger sister Nicknames: Core Monster, Tibetan Fox Favorite food: Chuupetto Personality: He looks blank on the outside, but he is quite sharp inside. He doesn't talk much but says what needs to be said, often acting as the straight man among the second-years. He seems to be good at reading people. He tends to do just enough rather than giving his all, even looking for shortcuts during roadwork. He has a quirky side, like quickly pulling out his phone to film the Miya twins fighting instead of stopping them, or imagining Kita talking to animals like babies. Despite being on the Inarizaki team representing Hyogo, he is the only one who uses standard Japanese instead of the Kansai dialect. He has brown hair and green eyes. He is handsome and resembles a Tibetan fox.