In 1910, Iwamoto Kodou, a boy enrolled at Suho Middle School under the direct command of the army, travels the country on the military's orders to look into paranormal events. One assignment takes him to a village said to have black snow, where he meets a boy who has special powers and believes they are a sickness. With Kodou's help, the boy sees that the two of them may share something, and he earns a recommendation to the school. Every place Kodou visits holds a new mystery, and the supernatural action unfolds as a romantic story of its era.