|Other names||'Samu (Atsumu Miya)|
|Family||Atsumu Miya (twin brother)|
|Team||Inarizaki High School|
|Occupation||High School Student (2nd Year)|
|Affiliation||Inarizaki High School|
|Image gallery (2)|
He has a large build and is very similar in appearance to his brother, which shows that they are most likely identical twins. Osamu's hair is slightly darker and his bangs are flipped to the opposite side.
Osamu seems to be the calmer of the Miya twins. He is shown to be rather laid back and deadpan. However, after Atsumu misses his serve, Osamu jokes around by booing him, so he does seem to have a sense of humor, at least in regards to his brother.
Osamu lives in Hyogo Prefecture and attends Inarizaki High School with his twin brother. He is currently a second year and is a member of his school's boys' volleyball team.
Tokyo Nationals ArcEdit
Osamu and Atsumu seem to be very close. Osamu knows Atsumu well enough to know exactly what makes him angry. He is also unafraid to make fun of Atsumu.