When hapless human twenty-something Kurusu Kimihito becomes an involuntary "volunteer" in the government homestay program for monster girls, his world is turned upside down. A reptilian lamia named Miia is sent to live with him, and it is Kimihito's job to tend to her every need and make sure she integrates into his everyday life. While cold-blooded Miia is so sexy she makes Kimihito's blood boil with desire, the penalties for interspecies breeding are dire.