Yakuza Fiancé – Raise wa Tanin ga Ii Manga

Yoshino was raised as the shielded yakuza princess of the Somei, Osaka’s biggest criminal family. No man has ever approached her because of her scary family and resting bitch face. Her grandfather offers her up as a truce wife to the grandson of the Miyama boss when he establishes a truce with the Miyama crime family, which is based in Tokyo. Kirishima Miyama is well-liked, endearing, and appears completely typical.
Beneath his smile, though, is a furious sadomasochist who becomes even more hungry for her authority when she shows him her moxie. Despite her knowledge of the terrible nature of yakuza, she is astounded at Miyama’s ferocity. With the East-West peace pact on the line, she can’t refuse him, so instead she braces herself to play ball.