Invitations to attend the Japan U-17 tennis training camp are exclusive, extended only to the top 50 middle school players in Japan, such as Ryouma Echizen. The camp was originally designated for high school players, but has since widened its scope to foster the country's most promising young tennis players for the upcoming U-17 World Cup. Regrettably, coaches needed to intervene as high school players expressed dissatisfaction with middle schoolers' inclusion, given that they were often outplayed. To address these concerns, new guidelines were put in place, dividing players into 16 different courts according to their skill level. Courts 2 through 16 accommodated all players, while Court 1 was reserved solely for elite players. Daily shuffle matches were conducted to permit players to adjust to their new positions. Middle schoolers were paired up and practised together prior to competing against one another in tiebreaker-style matches; the loser would be eliminated, while the winner would progress further in the camp. As players battled for their place in the camp and future prospects, they were confronted with both solidarity and competition dilemmas both on and off court. The high schoolers' resentment of middle schoolers' surpassing them escalated an already intense rivalry, resulting in complex situations that tested friendships. The players had to tackle these situations with maturity and determination.