Saya appears to be a beautiful 16-year-old girl, yet beneath her youthful facade lies the tortured spirit of a 400-year-old hybrid. As the daughter of a human father and a vampire mother, she has spent centuries in solitude, driven by a fierce desire to eliminate vampires using her exceptional samurai skills. However, she grapples with the harsh reality that her survival depends on blood, just like the creatures she pursues.