In the present, there exists a spiritual world unseen to the average human being -- the Feudal Underworld, a place where the spirits of ancient samurai warlords battle for supremacy, while influencing the land of the living. Ougi Takaya thought he was a normal high school student, until a man named Naoe Nobutsuna informed him that he is the reincarnation of Uesugi Kagetora, one of a clan that is dedicated to exorcising these spirits. With the help of old friends and the spurn of new enemies, can Takaya come to admit the truth behind his existence?