Monsters—they're real, and they want to date us!
Three years ago, the world learned that harpies, centaurs, catgirls, and all manners of fabulous creatures are not merely fiction; they are flesh and blood—not to mention scale, feather, horn, and fang. Thanks to the "Cultural Exchange Between Species Act," these once-mythical creatures have assimilated into society, or at least, they're trying.
When a hapless human named Kimihito Kurusu is inducted as a "volunteer" into the government exchange program, his world is turned upside down. A snake-like lamia named Miia comes to live with him, and it is Kimihito's job to take care of her and make sure she integrates into his everyday life. Unfortunately for Kimihito, Miia is undeniably sexy, and the law against interspecies breeding is very strict. Even worse, when a ravishing centaur girl and a flirtatious harpy move in, what's a full-blooded young man with raging hormones to do?!
The Centaur are a demi-human liminal race with the upper body of a human and the lower body of a horse. Herbivores, centaurs are normally found in grasslands and savannas, and are a race of nomads who become brave warriors in times of conflict.
Their civilization is ancient, by far the oldest of all the humanoid races known to mankind. Extremely proud and strong-willed, they differ from the other races in that they can characteristically consciously suppress their urges during mating season.