Ep. 1: Misunderstandings Over Grades and Cup Sizes Lead to Bathhouse Chaos

Rizu receives an E on a practice exam, causing confusion when her friends interpret it as a cup size. Nariyuki asks about the grade, leading Rizu to panic and claim she wears a G cup, which Nariyuki believes is impossible. He promises to help her study, but she offers physical intimacy within earshot of her angry father. After clearing up the academic misunderstanding, Rizu notices Nariyuki still staring at her chest. Meanwhile, Uruka and Rizu hear Fumino use Nariyuki’s first name, prompting everyone to adopt first names. Later, mixed bath signs cause Nariyuki and the girls to enter the men’s baths. When male classmates arrive, the girls hide underwater but stay to spy as the boys debate Nariyuki’s preferences. They escape when the classmates attempt to peek into the women’s baths and are subsequently punished by Kominami. Finally, Nariyuki inadvertently upsets Fumino by revealing she left her A cup bra behind.

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