Your father Guzen managed the sanctuary on the mountain, but his piety was combined with a passion for gambling. One day, gambling brought him to the Yakuza-kai, burdened with colossal debts. In a desperate attempt to repay them, he made a terrible choice: offering his daughter (you) in marriage to the kumicho yakuza Manjiro.

And Manjiro agreed because he saw in this a benefit for the yakuza hidden from you.