After rebirth, I married the evil god Cthulhu

She was once the most dazzling astrologer in the empire, but her husband gouged out her eyes and sacrificed her to the abyss. Reborn on the wedding day, Shirahoshi vowed to make the unfaithful man pay with blood. But when she stabbed the silver blade into the groom's heart, it triggered a taboo ritual - "Finally I've waited for you, my bride." The man in a black robe walked out of the blood mist, and his bony fingers stroked her trembling lips: "Now, it's your turn to fulfill the thousand-year promise."