Nanashi Mumei is a pretty average person in her opinion, decent grades, doesn't get in trouble, went straight from high school into college... Almost boring if you asked her, granted being a med student definitely makes things a little more interesting. However, when she needs some money to help pay for said education, her life gets... Much. Much more interesting, finding herself on the doorstep of a rather wealthy (and attractive) business woman to be her housekeeper. Something seems odd about this woman though, this... Ouro Kronii. Mumei starts having some doubts about what it is she actually does for her job, but, well... It's kind of hard to think of much of anything wrapped around the finger of the mistress of the house.