Ryouma Echizen is one of fifty nationally ranked middle‑school tennis players granted an invitation to the Japan U‑17 training camp. The program had previously been limited to high‑school competitors, and its elite sessions prepare the country"s top talent for the forthcoming U‑17 World Cup. The high‑school athletes are displeased that younger players have access, yet the middle‑schoolers quickly dominate until coaches step in. Coaches monitor closely, adjusting pairings to maintain fairness. The atmosphere is tense yet electric as players push boundaries. Daily drills focus on technique, stamina, and strategy, while evenings feature group discussions that foster mutual respect. Despite the rivalry, many athletes find unexpected camaraderie and shared goals. These bonds shape their future careers beyond the court.
Camp regulations are outlined early: participants are assigned to one of sixteen courts according to ability, with the strongest occupying Court 1. Players shift between courts based on "shuffle matches" that take place before daily practice. When the middle‑schoolers are asked to partner, they discover they will not play doubles with their partners; instead they face each other in a tiebreaker‑style contest. The victor earns the right to remain and refine skills, while the defeated must leave.
Friendships and teamwork are put on the line. As the rivalry between middle‑school and high‑school players intensifies, their struggles extend beyond merely surviving in the camp.
Production I.G 
M.S.C. Japan