Story :  One day, Mio finds a good-looking butler fainted in front of her building!? To repay her for helping him, this mysterious butler suddenly becomes her servant. Mio is confused at first, but since he says he'll do anything she wants, she asks him one day half jokingly... "Will you be my boyfriend?" The butler quickly changes...into a sadistic boyfriend...!? He ties her hands with an apron and... Her first radical experience of something like this makes her feel like her body and heart are melting... However, this pervert butler also has a serious mission...! Why not take a peek at the exciting life of this poor girl and the "wolf" butler?