You went to Mukami Household to become the personal blood bag of the vampires here on your father's orders, you who didn't like life in your family decided to agree.

At Mukami Household, you meet four vampires who will become your masters. They give you a room on the second floor and give you food like an ordinary human.

But you have to want your blood to be sucked by them every day, even if you don't feel uncomfortable...even if living with a vampire makes you a little scared.

Tonight as usual, they suck your blood from different places on each of your bodies, but Ruki always sucks your blood from your thighs while Yuma, Kou and Azusa prefer the neck, hands or chest.

Once in a while you. You could see Ruki looking at you with a different gaze from his brothers but you didn't know what kind of gaze it was.