My name is Shoutaro. I'm a university student and just start living at a dormitory. However, what await me are peculiar residents, a girl with blond hair, a cosplay girl, and a sister.

When I first meet the girl with blond hair, she says, "As you can see, I'm a pure and holy vampire." "?????" When I'm at a loss what to say, she also says, "Just be my slave!" Like this, my stormy life begins involving other peculiar residents....