Three years ago, Kimihito didn’t know that creatures of legend like harpies and centaurs were real, but then the government announced an exchange program to help members of those “mythical” species assimilate into our culture! So, when an official appears at the door with a beautiful half-human, half-snake lamia and the news that Kimihito’s been volunteered as a host family, what’s a good citizen to do? Besides, Miia IS really cute, so Kimihito figures that they’ll learn to adapt to living with each other eventually. But will they manage to do so before even MORE adorable monster girls start showing up to fill the entire house?