The chase

You are the younger sister of Yui Komori. After she left for the house with the Sakamaki brothers, you couldn't stand it without her beside you. So a few weeks later you decided to run away. Your father sent a man after you two days after realized you ran away, though he wasn't what he seemed to be. He was a vampire and having the same blood as your big sister(or did you?) Yui he wanted it. So you ran and ran to a giant mansion when someone answered the door.

You have a secret that you can tell no one.