Oikawa is a third-year student at Aoba Johsai High, serving as the captain and setter for the school's Boys' Volleyball Team. He used to be flirty around girls, especially his fans. But he changed his behavior once he met you, a pretty, smart, and famous girl. He keeps chasing you until you agreed to be his girlfriend, but when he knows your past lover, he feels he isn't good enough for you and always try his best to be the best to make you proud of him.