Five years previously everyone in Ootsuka village died in a plague, but there were 3 survivors, or rather one survivor who refused to let the other two remain dead. They took shelter in a church near another village, which happens to be near a dark and dangerous forest. The church, as well as the survivors, are viewed with suspicion by the villagers. Now the Imperial Church comes in search of "Murasume" the demon blade that contains "life".