Osamu Miya 宮治

Osamu is a second-year high school student who lives in Hyogo Prefecture, Japan.

Osamu appears to be the calmer of the Miya twins with a laid-back and deadpan personality. Despite his outward demeanor, Osamu is highly competitive and becomes heated even if it isn't obvious on the surface. Osamu is also shown to have a large passion for food. He thinks about it often in the middle of a match and would get distracted by the smell of it. He can't seem to pick a favorite food and wouldn't know what to eat as his last meal. Like his brother, Atsumu Miya, he loses self-control when it comes to eating. He's shown to have a sense of humor, especially regarding Atsumu, whom Osamu teases whenever he messes up.