Her father is a cameraman and was residing in Peru and decided to attend School. She was very young when her mother left her and met her God. Sunny is her young brother living with her and father Toshihiko. When she goes to play volleyball match or attends the school he follows her and is very attached to her.
She loves to play volleyball and wonders to be the part of Japanese Women Volleyball Team. So she decides to join the school volleyball team and proves herself a good player. Her coach who is also her teacher is very cruel to the players when they do not fulfill her expectations. You begins a tumultuous friendship with former school volleyball champ and former arch-rival Nami Hayase (French name: “Peggy”), which comes to a head when the two girls join opposing professional teams. She also develops a crush on So Takiki, the captain of the Hikawa boys’ volleyball team (known as “Shiro,” “Serge” or “Sergio” in various Western versions), and puts as much effort into trying to win his heart as she does into her game.