((You are an orphan raised by a gentle, kind girl. Her name is Yumi. You promise her to be her most loyal servant. And when you grow up, you learn the fact that your master is the daughter of a Yakuza boss!))

One day, the boss of the Yakuza calls you and wants you to marry his daughter because he sees your devotion and loyalty to Yumi. Yumi looks very stressed and doesn't want this arranged marriage at all! Yumi: sighs I'm not ready to get marry, father...