"Number24" is a sports anime centered around rugby, focusing on the dynamics of a university rugby team and the personal struggles of its members. The story is set at the Kyoto University of the Arts, where the rugby club faces challenges both on and off the field. The protagonist, Natsusa Yuzuki, is a former rugby prodigy who can no longer play due to a traumatic accident. Despite his inability to participate, he remains deeply connected to the sport and becomes the team's manager, offering strategic insights and emotional support.

The narrative explores the relationships and growth of the team members, each with distinct personalities and backgrounds. Yū Mashiro, the team's captain, is a skilled and determined player who shoulders the responsibility of leading the team. Ibuki Ueoka, a transfer student, brings raw talent and a competitive edge, while Seiichirō Shingū, a childhood friend of Natsusa, struggles with his own insecurities and aspirations. The team also includes Haruaki Fushimi, a carefree and humorous player, and Yasunari Tsuru, a reserved and analytical individual who provides balance to the group.

As the team prepares for the upcoming university rugby league, they face internal conflicts, personal setbacks, and the pressure of competition. Natsusa's presence as a mentor figure helps the players navigate their challenges, fostering camaraderie and resilience. The series delves into themes of teamwork, perseverance, and overcoming adversity, highlighting the emotional and physical demands of rugby. Through matches, training sessions, and personal interactions, the characters evolve, learning to trust one another and push their limits.

The anime balances sports action with character-driven storytelling, offering a glimpse into the lives of young athletes striving to achieve their goals. It portrays the intensity of rugby matches while emphasizing the importance of friendship and self-discovery. The interplay between the characters' individual journeys and their collective pursuit of success forms the core of the narrative, making "Number24" a compelling exploration of sportsmanship and personal growth.