Attacker You! follows the story of You Hazuki, a spirited 13-year-old girl who moves to Tokyo to live with her father and pursue her passion for volleyball. With her brother Sunny by her side, You navigates school life while harboring dreams of representing Japan in the 1988 Seoul Olympics. As she joins her school's volleyball team and rises in skill, she faces a demanding coach and forms complex relationships, including a tense friendship with former rival Nami Hayase. Alongside her sports aspirations, You also grapples with her growing feelings for the captain of the boys' volleyball team, adding a layer of romance to her journey.