"Attack!!" is a sports manga centered around the intense and competitive world of high school rugby. The story revolves around Kenji Gion, a first-year student at Kakei High School, who joins the rugby team despite having no prior experience in the sport. Kenji’s raw athleticism and determination quickly set him apart, and he becomes a key player for the team. The narrative explores his growth as a rugby player, his struggles to adapt to the physical and mental demands of the sport, and his relationships with teammates and rivals.

The Kakei High rugby team is depicted as an underdog squad striving to compete against more established and skilled teams. The series delves into the dynamics of teamwork, leadership, and perseverance, highlighting the challenges faced by both new and experienced players. Key characters include the team captain, who serves as a mentor figure, and other teammates who each bring unique skills and personalities to the group. Rival teams and players are also prominently featured, adding tension and stakes to the matches.

The plot progresses through a series of matches, each serving as a milestone for Kenji and the team’s development. The matches are detailed and strategic, showcasing the technical aspects of rugby while emphasizing the emotional and psychological struggles of the players. Themes of camaraderie, rivalry, and personal growth are woven throughout the story, as characters confront their limitations and strive to improve both individually and as a team.

"Attack!!" balances its focus on sports action with character-driven storytelling, providing insight into the motivations and backgrounds of its cast. The series captures the highs and lows of competitive sports, from the exhilaration of victory to the crushing disappointment of defeat, while maintaining a grounded and realistic portrayal of high school athletics.