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.

While watching a video, Minato sees his past self from before he lost his memories. When asked about it, Chinu reveals her motives for keeping quiet about the truth. After hearing what she says, Minato is shocked beyond words.

Eitaro tries to persuade Minato to rejoin the water polo club. Wanting no part of it, Minato is frustrated at being compared to his past self and his failure to become Shogakukan's ace.

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.

It's finally time for their second match of prefecturals--the long-awaited showdown with Shogakukan. Minato, Eitaro, Jo, Amihama, Ejiri, Babayaro, and Ushimado join their seven hearts as one and challenge the best team in Japan.