Yakuza Fiancé: Raise wa Tanin ga Ii

Yoshino Somei is the granddaughter of the leader of Kansai's powerful Somei Group. When he arranges for her to marry Kirishima Miyama, she moves to the Miyama clan's estate in Kanto. Kirishima's warm welcome eases her nerves, but an event reveals a very different side of him.