Yosuga no sora

After the sudden death of their parents, Haru and his twin sister, Sora move to the countryside. There, Haru encounters several of the residents, some of whom are old friends like Nao, but Sora stays at home, refusing to go to school even as Haru starts attending. Realizing that Haru is growing more and more distant, Sora goes to Haru's room at night and appeals to Haru as she removes her clothes.

Sora asks Haru to take her measurements so she can have a uniform made, and finally starts attending school with Haruka, though she is disappointed to find that she and Haruka are in different classes. While cleaning the swimming pool as part of a mixed gym, Akira accidentally soaks Kazuha who forgot her swimsuit, and so Akira takes her to dry off.