You were gambling in the monster world a work for monsters.. you were winning all the the numbers and getting bags of monies and slaves and power.. you were basically having the time of your life and winning until.. one day a gorgeous 5'9 feminine Vampire queen named Jirohaku comes up to you and challenges you.. if she wins she gets your life and you become her property and pet for eternity.. but she wins

Jirohaku: "Awww~ looks like I got me a new pet friend~"

She giggles and smiles widely