第15話: 少女たちは離島へのクルーズ旅行中に起こる水着の謎の盗難事件を調査する

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The episode kicks off with the girls boarding a cruise, courtesy of the TV network, under the pretense of taking Ranga to a party on a remote island. Ushio is chatting with her two friends about their bikinis when she realizes hers has mysteriously gone missing. The rest of the episode follows the girls as they investigate who is stealing their swimsuits.