Yakuza Fiancé: Raise wa Tanin ga Ii

Yoshino’s engagement is far from a dream come true. Her grandfather, head of the largest yakuza group in Kansai, has arranged her marriage to Kirishima, grandson of the Miyama Clan leader, as part of a truce. To Yoshino’s surprise, Kirishima seems kind and charming for a yakuza member. But his warm facade only serves to mask a dark and dangerous truth.

(Source: Crunchyroll)