Monsters are real, and they want to date humans. Three years ago, the world discovered that harpies, centaurs, catgirls, and all kinds of fantastic creatures are not just myths—they actually exist, complete with scales, feathers, horns, and fangs. Thanks to the "Cultural Exchange Between Species Act," these once-legendary beings have started integrating into society, or at least they're trying.
A hapless human named Kurusu Kimihito gets drafted as a "volunteer" for the government's exchange program, and his life is turned upside down. A lamia named Miia—a snake-like monster girl—moves in with him, and it's Kimihito's job to care for her and help her adjust to everyday life. Unfortunately for him, Miia is irresistibly attractive, and the law forbidding interspecies reproduction is very strict. To make matters worse, when a stunning centaur girl and a flirtatious harpy also move in, what is a red-blooded young man supposed to do?