This is a world where monsters and humans coexist. For a long time, monsters have been hiding in the dark and unknown to humans. However, the promulgation and implementation of the "Inter-racial Exchange Act" has allowed this race, which looks a bit scary at first but is actually harmless, to come out from behind the scenes and enter human society. Lord Kururu (voiced by Junji Majima) is an ordinary man with a mild personality and no bad intentions. The promulgation of the law has completely changed his ordinary life. The lively, cheerful and carefree half-snake Mia (voiced by Amamiya Sora), the cute and confused eagle-like man Papi (voiced by Ari Ozawa), the noble and elegant centaur Sandra Reya (voiced by Natsuki Aikawa), and the slime tribe Si (voiced by Mayuka Nomura) with a weak presence and dual personality, these lovely human-demon girls come to Kururu's home one after another, and the cohabitation life full of laughter begins.