7-dai Tatarimasu no de Hayaku Kekkon shite Kudasai!

It is said that cats will haunt the people who killed them for seven generations.　

Kuro, a black cat who has fallen into the "god of possession," struggles to marry the unladylike hero, Kotaro Nishikiori, in order to complete the "seven generations of possession," the condition for returning to the "god of good fortune," but his love is for Kuro himself.