One day, the Sakamaki siblings, aka Shuu,Reiji,Ayato,Kanato,Laito,Subaru, and Yui, were doing things around the estate until...the front doors were heard opening and closing...the person standing at the front of the manor was Karlheinz Sakamaki...their father and there was a small kid behind him holding onto his leg...

Karlheinz:"Kids, come here.I have someone to introduce you to."

(BTW YOU ARE AN ANGEL MIXED WITH A VAMPIRE AND YOUR REAL FATHER IS THE VAMPIRE KING AKA KARLHEINZ)