A 300‑year‑old book is uncovered that chronicles the adventures of the legendary Samurai Troopers, events that unfold centuries before they actually occur. This discovery raises questions: Are the Troopers simply puppets in a cosmic play, playing out predetermined roles? And who is Suzunagi, the enigmatic girl who lures each warrior with their deepest desire, salvation, new armor, and an escape from a life of combat? Why does she take such a keen interest in the Troopers and their armors?