Natsume Minami

The Amami family, Hassaku, his older sister Mao and younger sister Airi. Their parents founded a school to foster love between the students but they passed away in an accident. Now their aunt Mei has taken possession of the school and forced Mao away so nobody could challenger her position. Mei's plan is to turn the school into a Mecha-con school where girls are trained to be sold as the perfect brides for wealthy men. To do that she needs to convert the school into an all girl's school.

Suomi-sensei surprises – or rather shocks – her class with the announcement that the destination of this year’s class trip will be a nude beach. And before the first thoughts purposely missing the event come up, she cheerfully announces that non-participation will result in expulsion from school. She hopes for this excursion that the friendships among her students will deepen and that they will grow together as a community. At the beginning, nobody knows where to keep their eyes and everybody is more embarrassed than anything else, but the class president, of all people, who is considered very level-headed, is the first one who can’t hold on any longer. Suomi-sensei has also taken precautions for this and set up a “cooling tent”. However, the students are only allowed to enter it in pairs…