Fourth grader Kasumi Haruno comes to Kasumi Town to see off her parents, zoologists heading to Africa for research. While they are away she will lodge at the huge mansion of the Kasumi family, which sits in the middle of town ringed by forest. Something odd hangs in the air around the place, and inside she finds appliances that can talk. The Kasumi family turn out to be youkai known as Henamon. To earn her keep, Kasumi takes on the cooking, laundry and cleaning, and a busy new life begins among her strange companions. The show mixes fantasy with slice-of-life everyday routine.