Kyouganeke no Hanayome

For a thousand years, the exorcists of the Kyogane clan have dedicated their lives to eradicating the gruesome demons that haunt Japan. Kuro Kyogane, the current clan head, has no interest in getting married and producing an heir. But after his family arranges a suitable bride in the brave and optimistic Fuyu, he agrees to fulfill his obligations. What Kuro doesn’t know yet is that his wedding ceremony conceals a dark secret—and once Fuyu is declared his wife, she may never be safe from harm again…

(Source: Square Enix)