Hinata takes Aoi to visit Azuma Gorge, suggesting they invite Kaede and Kokona along to go swimming in sexy swimsuits. Aoi, who only has her school swimsuit, tries to pick out a sexy swimsuit for herself. After several unforeseen events leave the river unfit for swimming, the girls instead decide to wear their swimsuits in Hinata's garden pool, where Hinata's "sexy" swimsuit turns out to just be her school swimsuit.