Hitokui Oni no Hanayome

Overview

"It's always been you that I've wanted." From an early age, Riko has been bullied for her crimson eyes, with people calling her "filthy" and "cursed by a monster." She marries Shuten-douji, a man-eater, in place of her sister, and heads to the mansion, prepared to die. But beneath the cherry blossoms, the demon stands, smiling---? Does the crimson eye reflect fear, or love? It's a tale of interspecies marriage, as fleeting as a dream. (Source: Comic Days, translated)

Source: AniList