Ryouma Echizen, a gifted middle school tennis player, secures a coveted spot among the elite 50 invited to the prestigious Japan U-17 tennis training camp. The camp, traditionally reserved for high school prodigies, aims to hone the nation's finest for the eminent U-17 World Cup. Tensions arise as the high school attendees bristle at the inclusion of these younger talents, only to be outmatched by the middle schoolers until the intervention of the coaches. The camp's structure is unveiled: players are assigned to one of 16 courts based on their prowess, with the top-tier competitors occupying Court 1. Daily 'shuffle matches' determine players' movements between courts. To heighten anticipation, the middle schoolers are paired off, expecting doubles play, only to discover a twist—they face each other in intense tiebreaker matches. The victor earns the right to stay and refine their skills, while the defeated must bid farewell. In this crucible of tennis, bonds and alliances are tested as friendships hang in the balance. Amidst the escalating rivalry between the aspiring youngsters, the stakes transcend mere survival in the camp, delving into deeper complexities.