Hidaka Akira is a high school student who loves solitude. He avoids the crowds in his class and decides to eat alone, but there is someone who disturbs his peace. It is Tsukimine Chiyo, the girl at the highest level in the school hierarchy, a girl who is absolutely beautiful. Tsukimine called Akira and asked him to do his "usual thing". What kind of "normal" did they mean, and why were her clothes off...?

Two sisters share their experiences and thoughts one summer vacation in Matsuyama, Ehime.

When Mizuoka sneaks into the pool after hours for extra swimming practice, he's caught by his classmate Hino! Hino agrees not to tell anyone he's broken in, provided he teaches her how to swim. Mizuoka agrees, and, though he finds himself liking her more and more, he really needs the extra practice for his swimming club status. Will Mizuoka's dedication to his club ranking destroy his chances with Hino?