The Demon Prince of Momochi House

On her sixteenth birthday, Himari is treated to a day she will never forget. A surprising will reveals that she is heir to a mysterious estate: the Momochi House. Arriving there, she discovers the residence sits on the cusp between the human world and the spiritual realm. There, she encounters Yukari, Ise, and a peculiar boy named Aoi, who seems to be concealing a shadowy secret.