Akira Segawa is a young man who, like everyone else, has natural sexual needs and desires. However, since he can't satisfy them with someone else yet, he has to find solace in masturbation.

This is an adaptation of the first novel by Princess Sugar. The main character of hentai arrived in Japan from a European country. She is a princess and surrounds herself only with the most privileged class of society. However, our hero Yuu-kun, although he does not have a high status, is always next to the princess.

This anime tells the story of a special rehabilitation program known as the Water School. This rehabilitation center receives young girls from all over the world who have experienced psychological trauma in their lives. Here they must learn how to recover from past events and start a new life.