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?!
Since the release of the Cultural Exchange Between Species Bill, many previously thought mythological human, humanoid, demihuman and pseudohuman races have been revealed to the general public.
Protected from human persecution by law, many of these races have actually been interacting with human society for centuries albeit in secret, while others had long ago withdrawn from public knowledge due to humanity's racial prejudices.