Minato learns from Chinu Kawakubo about a promise they made in the past. To fulfill their promise, he decides to join the water polo club, much to the delight of Eitaro Oka and the team captain, Jo Jojima. They utilize his fame to recruit members, but...

Amihama stubbornly refuses to join, but a certain something changes his mind and Yamanami's Water Polo Club is officially underway. Despite the team struggling with the basics, they find themselves playing their first practice match.

Though they're only up against a junior team, the club learns just how intense water polo, aka "water wrestling," can be. Minato's spirits are crushed by his own uselessness, but that night, Eitaro pays a visit and reveals a big secret he's been hiding.

Hoping for their first win at the summer prefectural tournament, the club holds a training camp during Golden Week. The team is getting along and there are good vibes all around, but all the while, something weighs on Ushimado's mind.

Jo, the water polo captain, proposes that the team creates an original jersey. But emotionally attached to his own, Amihama declines saying, "I don't need a jersey."

The Yamanami water polo club nervously faces the day of the prefectural tournament. Minato spearheads the team as they battle Rikka Gakuen in the first match, but their opponents have come up with a strategy to keep Yamanami from going on the attack.