The Demon Prince of Momochi House - S01

Orphan Himari Momochi's only link to her late parents is the house they secretly left her, which she does not learn about until her 16th birthday. Excited for the chance to learn more about her family, Himari arrives at the rumored haunted house and is confused to find three young men already living there: Aoi Nanamori, who calls himself the guardian of the place, and his two familiars, Yukari and Ise. They let her stay the night, but warn her to leave the next day so she can avoid harm from ayakashi, wandering spirits that sometimes attack humans. To her surprise, Himari is unaffected by the spirits she encounters and is set on moving into the house. After she learns that Aoi became guardian by accident and is now trapped on the property, forgotten by the outside world, her determination only grows. Moved by his story, Himari decides to find a way to free Aoi from his bleak fate, and she persuades the three Momochi House protectors to accept her as their landlady. But the mysterious Kasha, who keeps sending hostile ayakashi to Himari's new home, seems to have darker plans for Aoi's future.