At Yachimata, there is a legend of a deity named Tayutayu-sama, who protected the area, but this deity and other so called "Tayutai" have been lost in time. Mito and his friends discover a relic on the school grounds with mysterious patterns on them. Then at the opening ceremony of the new school year, an equally mysterious girl named Mashiro appears before Mito, Mashiro is somehow tied to the relic and the legend of Tayutayu-sama.