In a world where mythical beings like harpies, centaurs, and catgirls are real, the 'Cultural Exchange Between Species Act' ushers them into society. Kurusu Kimihito, an unwitting human participant in this program, finds his life upended when he becomes the caretaker of a snake-like lamia named Miia. Amidst strict laws against interspecies relationships, Kurusu must navigate the challenges of living with a seductive lamia, a charming centaur, and a flirty harpy, testing his resolve and desires.