The story follows Dome Shinjo, a ten‑year‑old boy whose father was a legendary Yomiuri Giants player. Dome inherits both a deep love for baseball and exceptional talent from his father, yet his mother and older sister discourage him from practicing the sport. Before his father’s death, he taught Dome a powerful, almost magical swing. After his mother gives Dome the glove his father once wore, he demonstrates this extraordinary shot during a Giants training session, earning an immediate contract with the team. With the guidance of veteran players, Dome’s presence makes the Giants unbeatable at home, and no major hitter in the Japanese professional league can counter his signature swing.