Seigaku and other middle school students (with a total of 50 middle school students) are invited to the U-17 selection camp. Ryoma also comes back from America to participate. The high school students there dislike the middle school students.

At the training camp in the mountains, the middle schoolers are given rackets filled with lead and are forced to hit balls with the rackets. Meanwhile, in the U-17 camp, Court 5 have team shuffle matches with Court 3.

The winning middle school team start the next stage of their hard training right away. The losers face the biggest challenge of their lifetime given to them by the mental coach, Saitō.

The losers reach the mountain peak and meet a drunken coach in primitive clothing.

Ryoma, Tanishi, and Kenya receive a letter from Coach Nyudo asking them to sneak into the training camp to acquire training supplies.

The middle schoolers, once again, have to face the challenging demands of Coach Mifune.

The Black Jerseys challenge Court 2.

The middle schoolers pair up with friends, and find out that they will be playing singles tie-breaker matches against their partner.

The matches continue, and the losers are forced to leave the camp. What happens now?

As Tezuka leaves, Fuji challenges him to a match.

Momoshiro gets paired up immediately in a shuffle match, being the first middle schooler to do so. His opponent is Jujiroh Oni.

The matches between the Black Jerseys and the camp winners concludes.

Tezuka plays Kaidō and Atobe plays Hiyoshi. Both captains have a plan from the start to teach their juniors a lesson before defeating them. Meanwhile, Ryoma and Kintarō are playing matches with Tokugawa and Oni.