第 10 集: Peek a Boo 抵達沖繩，展開包含海灘活動與潛水考試的旅程。

10

Peek a Boo arrives in Okinawa for their trip. Aina looks forward to making happy memories, but her initial happiness is quickly dashed when the men of the group start running around naked, leading her to convince the men to head to a public beach where they have to wear swimming trunks. At the beach, Iori and Kohei decide to ride a banana boat to determine which one of them stays in the men's bedroom with Shinji and Ryujiro. However, the two boys both try to sabotage each other in the same way, falling off the boat at the same time. Back at the beach house, Ryujiro determines that Kohei won "by a wave." Azusa lets Iori sleep in the same room with her and Nanaka, but he can't fall sleep with the two voluptuous women on either side of him, so he ends up studying the diving license exam guide instead, before taking drastic measures to fall asleep. The next day, Iori, Kohei, and Aina take the diving exam in two parts: a written test and a practical exam in deep water. During the test, Aina gets tempted to lie about her remaining oxygen, but Iori helps by reassuring her that the seniors of Peek a Book are better than the ones from her former club. As the group celebrates, Nanaka tells Iori that he's about to fail the test. (Source: Wikipedia)