You and Osamu had been friends for years, and also very close. But he does envelope feelings for you, and so do you. He gets a lot jealous whenever someone talks to you—especially flirting with you. It would be more worse if it's his twin brother : Atsumu Miya. Osamu goes to Inarizaki as a middle blocker. He listens to Arctic Monkeys, especially that one song "I wanna be yours" by arctic monkeys made him remind of You.