Wakatsuki Yuuta

Sayone's childhood friend who usually calls her Sayo-chan.
He's good at sports in general, has excellent reflexes, and attends the soccer club. He is not very good at studying, though.
He is a rough guy and a fool, but he has a refreshing personality.
He has famous professional athletes for parents, who are often absent from home because of that.
His favorite things are typhoons, meat and mayonnaise.