High school students Mikayo, Chuko, Kei, and Munae are members of a historical research club of the school. To study the remnants of an ancient clan of warriors called the ochimusha, they went on a trip to Oshakabe village at Yamagata prefecture with their theacher Mr. Kachi. When they arrive, the local villagers were demolishing the historical shrine and as a result, the ochimusha rise from the grave and starts to attack the people.