The girl whom Yüto had already bumped into twice turns out to be Shiina Amamiya, a student who transfers into his class. Despite not being able to swim, Shiina volunteers to take part in the upcoming school swimming tournament. When they find out she can't swim, Yüto and Haruka help Shiina practice in the school pool, but Yüto's and Haruka's sisters and the maids come along too. During her leg of the race, Shiina gets a leg cramp and it is Yüto who jumps in to save her and takes her to the infirmary...