Caroline Edela, a vampire girl who lives in 222C Baker Street, has recently lost her memory. Then, a psychopath moved in next door in 221B. From time to time, there was a tortured violin sound like sawing wood. Caroline was almost mentally deranged. As a vampire with over-developed hearing, Caroline decided to use a wrench to knock off her neighbor's dead head. However, after meeting this neighbor, After all the good looks, my passion for giving this big pig's hooves some color turned into cholesterol... Mr. Detective: Who are you? Caroline: In fact, I have always wanted to tell you, but I just don't know how to say it. Mr. Detective: Please be free... Caroline: I am your sweetheart~ Mr. Detective: Shut+up!