Ep. 1: Koyori and friends visit a new spa while Takeshi and Mayuko attend separately.

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This episode takes place between broadcast episodes four and five. Koyori wins tickets to a newly opened family spa and water park, attending with Yorito, Mana, and their friends, while Aono remains hospitalized. Takeshi also wins tickets and brings Mayuko. At the park, Takeshi initially chases Yorito, believing Matsuri is present, but she cannot attend due to her Yaka condition. Once Takeshi realizes Matsuri is absent, he calms down, and Yorito meets Mayuko along with the other friends. After sunset, Matsuri arrives at the park, but Takeshi and Mayuko have already departed. The OVA omits that Mayuko is also a Yaka and depicts all girls in a mineral pool with sunset-colored windows.