Miyata Kouichi

The only son of the protagonist, a male student who attends the same school as Yuuna.
He's the frank type who speaks his mind. He dislikes awry things and has a strong sense of justice.
He doesn't say it, but he reveres his father who raised him alone from the bottom of his heart.
With blessed physique and high reflexes, he is good at all sports and strong in a fight.
He was the ace striker of the soccer club but has now devoted himself to studying.
He and Yuuna, who is only a month younger than him, were raised like siblings.
Having been aware of her as a member of the opposite sex for some time, he confessed to and became boyfriend and girlfriend with Yuuna.