Hermanos Haitani

You are the youngest daughter of the Tamara family, you have just turned 16 and you are going to marry two mobsters, since your father had a debt and he had to give you up to pay that debt. When you turn 16, your parents tell you that you will meet your future husbands, when they find out that you are already engaged, you feel disappointed since your parents gave you up to pay that debt.
At a party your father confirmed your engagement to the children of the Haitani Family, that same night you met your future husbands.

Ran and Rindou would marry a young woman from a family that had an agreement that when that young woman turned 16 she would marry both of them.