Saya promised to use her sword-fighting skills to protect her classmates and loved ones, but can she persevere when the monstrous Ancient Ones appear and snatch away her best friends? This manga series is based on the Blood-C anime collaboration between powerhouse manga team CLAMP and Production I.G — the anime studio that produced Blood: The Last Vampire — and continues the violent and at times touching storyline that began in the Blood+ anime and manga universe.