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 which exists on the barrier between the human and spiritual realms.

Himari is still coming to terms with Aoi's rejection of her love confession when Takamura Nachi, the Classical Literature teacher, shows her a mirror that is said to reflect the true feelings of its beholder...