Born into a family that can see yokai, 11-year-old Miharu, who is not good at yokai, has been living alone since the death of his grandfather, who was the only member of her family, enduring the pranks of her relatives and yokai. One day, a large yokai "Kochi" appears with a curse arrow stuck in his back. Apparently, it takes a light to break the curse on your back. However, there is also a "certain curse" on Koharu.