suru

To encourage Nagi to swim and enjoy summer, Maria invites various friends to their Sanzenin family's private beach. While everyone is having fun, Nagi hesitates to wear swimsuits and come out because of her small breasts, and refuses to join.

The story continues with Rin Kokonoe is now a 4th grader student while Daisuke Aoki becomes her homeroom teacher for another year. As they get to know and understand each other more, Aoki become more confused of his feelings towards Rin.

Amu Hinamori is a student at Seiyo Elementary, where she has a reputation for being "cool and spicy"; however, her real personality is that of an extremely shy and easily intimidated girl. One night Amu makes a wish that she would have the courage to be reborn as her "would-be" self.

Maiku Kamishiro grew up in a orphanage with only a childhood picture of himself and who he believes is his twin sister. He thought he finally found his home when he managed to find the house in the picture and moved into it.

A small, lone Kappa miraculously survives over 200 years into modern day Tokyo, Japan when he is found by young Koichi. "Coo" who is secretly adopted by the whole family, faces a tragic past and the present's challenge of living in a dramatically changed environment, searches with his new human friend for places not invaded by people hoping to find any remaining of his kind.