Author: Yo Asami

Illustrator: Takaya Kagami

Cover: Takaya Kagami

Would you sacrifice your love to save your family?

Hoping to save his loyal followers and friends, Guren makes the ultimate sacrifice and relinquishes his humanity to accept the demon within his cursed uniform, transforming him into a demon. His new demonic powers help him protect the important people in his life, but the victory is short-lived. A few hours later, the presumed heir of the Imperial Demons, Kureto Hiragi, captures Guren's entire family and their followers, offering him an impossible choice: to witness the death of his childhood love Mahiru Hiragi within a month or to see the Hiragi family execute all his branch - starting with his father.

Left with no choice but cryptic information about a secret research project that could destroy the world and whispers of an underground city of vampires, Guren must face the most important decision of his life. And all the while, time is ticking down to destruction...