Himari inherits a house that doesn't belong to the human world, and the boy living in it is hiding something that matters more than the mystery itself. Romance isn't decoration here, it's the entire reason the supernatural setting exists, and watching her choose to stay despite every reason to leave hits harder than the plot has any right to demand. The show is thin on spectacle but brutal about what it costs to love something that isn't safe.

Himari inherits an estate on her sixteenth birthday, only to arrive and find herself standing directly between two worlds. The Momochi House sits on the border where the human world meets the spiritual realm, and its residents are far from ordinary. Aoi Nanamori calls himself the house's guardian, and Yukari and Ise serve as his familiars, but Aoi seems to be hiding a dark secret. The three warn the orphaned Himari to leave before wandering spirits called ayakashi can harm her. Undeterred, she decides to move in. When she learns that Aoi became guardian without knowing it and is now bound to the property and forgotten by the outside world, she resolves to find a way to free him. Meanwhile, a mysterious figure named Kasha keeps sending hostile ayakashi to the house. Romance and the supernatural share the stage in this twelve-episode TV series.