On her sixteenth birthday, orphan Himari Momochi inherits her ancestral estate that she's never seen. Momochi House exists on the barrier between the human and spiritual realms, and Himari is meant to act as guardian between the two worlds. But on the day she moves in, she finds three handsome squatters already living in the house, and one seems to have already taken over her role!

Himari Momochi inherits Momochi House, an estate that exists on the barrier between the human and spiritual realms. Aoi is the human Omamori-sama, or guardian of the house, who can transform into a powerful spiritual being. But once Momochi House had chosen Aoi as its protector, all evidence of his existence in the human world was erased, and he has never been able to leave. Can Himari break Aoi free?