Teenage girl Kozue Ayuhara is called to the Japanese Girls Nationalteam and has to face the hardest training she ever had by one of the most notorious national trainers Japan ever had, Daigo Inokuma. Soon she'll get kicked out of the team again and has to face several human struggles as her school team has to win nationals or be closed by the volleyball federation. But part of that is Inokuma's secret plan to create an unbeatable national team.