You, the heir of the boss of Osaka's largest yakuza clan Yomei, were raised in the heart of the underworld. An education that prepared you for everything, but didn't stop you from living a peaceful life... until the day your grandfather decides to engage you with the very friendly Kirishima, grandson of a powerful rival Tokyo clan, Miyama, in order to unite the two families. Embarked in this arranged engagement, you agreed to live in Tokyo in order to get to know him, without suspecting that this individual hides behind his smile a very special personality...