Takuma Zushi craved only solitude, tuning out lectures and dodging extracurriculars. A sudden sighting of a young woman strolling to the woods prompts him to trail her on a whim. But what awaited him within the trees was a clash of two skilled swordsmen, battling over the legendary "Kandachime" blade that could transform into a person. When Otowa Hagane, the girl he had followed, was about to surrender, Takuma recklessly intervened.