Mio Chibana

Age: 21 (currently)
Birthdate: December 25, 1999
Favorite food: curry

Mio is a Okinawa local.

He was orphaned when he was young. His mother and father passed away making him seem distant and cold. He meets Shun Hashimoto and they become friends. Later, they become lovers and overcome the struggles of coming to terms with their feelings and others' reactions to their relationship.
(Source: Wiki, edited)