The story of Haitai Nanafa revolves around an energetic middle school girl named Nanafa Kyan. Nanafa lives in Okinawa with her grandmother who runs the “Kame Soba” soba shop, her beautiful older sister Nao who is in high school, and her younger sister Kokona, who is in elementary school and has a strong ability to sense the supernatural. One day, Nanafa witnesses a seal fall off of a Chinese banyan tree, and three spirits who live in that tree are unleashed.