A species akin to humans, called 'cats', coexists with them in a particular world. Here, manual labor and sexual services are exclusively shouldered by humans, while cats go through 'heat cycles'. While male cats experience numerous heat periods, unlike their female counterparts, they primarily rely on human men for relief and medications to curb the effects of these cycles. In a country within this universe, a black cat residing in an enormous mansion happens upon a peculiar man one day. This cat is believed to be cursed.
