The training camp strips away the tournament structure and just lets rivals exist in the same space, which means every match feels like settling something personal. New techniques arrive constantly enough that you stop predicting who wins, only wondering what impossible shot someone's been hiding. It's lighter than the original series in ways that let the cast breathe, but the setup trades some of that earlier tension for pure competitive joy.

Ryoma Echizen is one of 50 top middle school tennis players invited to Japan's U-17 training camp, which was once reserved for high schoolers and prepares players for the U-17 World Cup. Rivals from the national tournament, including Seigaku, Hyotei, Rikkai and Shitenhoji, meet again there. The high schoolers resent the newcomers, and the middle schoolers overpower them until the coaches step in. Players are ranked across 16 courts and move up or down through daily shuffle matches. When the middle schoolers are told to pair up, they learn that partners will face each other, and the loser goes home. The result is a competitive sports series with comedy, where friendships are put on the line and stronger opponents and a mysterious coach soon appear.