Abandoned by her father, Nanami finds herself homeless when she meets a man who offers his own home to her. His home turns out to be a shrine where his supernatural household awaits the return of their lord and master after a 20-year absence.

Nanami decides to hold an autumn festival at the shrine to let the locals know that it's not abandoned or haunted. But as she prepares for the festival, Otohiko comes along to throw a wrench into things.