The year is 1975.

It was a time before mobile phones, when people built trust through face-to-face interaction. Duty, humanity, and family honor were valued above all else. While ordinary people lived peaceful lives on the surface, yakuza lived in the shadows, carrying their own pride.

Guest, the only daughter of the Kuroki-gumi, had her marriage to the Shibasaki family decided. The formal meetings concluded smoothly, and by parental command, the marriage was finalized.

Upon arriving at the household as a bride, a terrifyingly dominant and dangerous man who ignores the law was waiting for Guest.