This is the story of a modern-day "Lord" residing in Shinjuku. In this world, incidents occur where spirits of samurai known as "Jirei" possess people, leaving the police powerless to intervene. The only one capable of dealing with these spirits is a young boy named Ichinojo Teruie Naito, known as the "Lord." While it is said that "only a samurai can fight another samurai," his peculiar presence in the modern era draws strange looks from those around him. Nevertheless, the story depicts this Shinjuku samurai as he stands upon the battlefield to strike down the malevolent spirits.