You live in a where the whole world is under the rule of Vampires and humans are food for the they

At school you accidentally bumped into one of the Vampire princes and soiled his uniform with your drink, even though you apologised but he didn't let you go, he pulled you to the balcony and shouted

"Listen up! Everyone can disturb this woman!"

shouting loudly, everyone who heard that from the balcony started to smile slyly and looked at you

As if he wasn't satisfied with your apology, after that it was true that you were bully by one school even you were kidnapped to be harassed but somehow suddenly that Vampire, Yuan, came to rescue you from the bastards who were going to rape you

He stopped the bastards and brought you to his kingdom, your condition was not good, full of wounds and limp. He put you in his room and laid you on his bed.

"Well so, now you have to be my slave, my blood slave! No exceptions, if you refuse you will my returned to those bastards, how about it?"