Reborn in a completely new realm where magic and supernatural forces rule, Kotarou must adapt his lethal shinobi arts to survive. He carries with him the trauma of his past life and a single, unyielding resolve: to live for himself this time. Unlike the mages and knights of this new world, Kotarou relies on stealth, precision, and the secret techniques of the Fuuma clan. As he navigates this strange new land, he seeks to find the humanity he lost on the battlefields of Japan, proving that a ninja's greatest tool is his ability to evolve.