20 years ago, Weve Aliens came to Earth in search of marriage partners. Weve are perverted and love interbreeding. With their advanced technology, they have solved humanity’s problems with the environment, food, and resources. Gen is a student at the prestigious Human-Weve school Shinryou Academy. Due to his late grandfather’s words, he loathes Weve and believes that pure humans will eventually die out if something isn’t done about Weves soon. However, Gen meets the Weve girl Mirika, who falls in love with him.