Ep. 4: Amihama bergabung dengan Yamanami setelah mengungkapkan rivalitasnya dengan Riku, yang mengarah pada pertandingan latihan melawan junior Rikka Gakuen.

At the team's insistence, Amihama reveals his reason for disliking water polo is that he always wanted to beat his brother at a sport; but after his brother quit swimming, the only sport at which Amihama's skill rivaled his, Amihama quit swimming as well and has refused to get back in the water. After an incensed exit by Amihama, Minato's former teammates Keita, Koki, and Riku visit Yamanami High and meet Minato's new team. Just as the team laments having failed to secure a seventh member, Amihama reappears and says he's now interested in joining the team—revealing that Riku is actually his brother and that he now wants to be a part of Yamanami's water polo team so that he can have a chance of defeating Riku at a sport. The Yamanami team begins practicing, even as the captain of the neighboring Rikka Gakuen Academy's team dismisses them as non-threatening. When the Yamanami team enjoys a moment of bonding, Jou reveals that he has arranged a practice match against another team for the upcoming weekend (a feat accomplished in part due to Chinu's requesting it of Rikka Gakuen's captain). At the last minute, however, the Rikka Gakuen High School team withdraws; and the Junior High team plays in their stead, a strategy by the High School team to prevent Yamanami from seeing their ability before an official match. Despite a seeming advantage in size, Yamanami's members find it difficult to keep up with the Rikka Gakuen juniors. (Source: Wikipedia)

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