On Christmas Eve 1999, a New York subway team unearthed an 800-year-old Celtic skeleton and an odd key. Archaeologist Karen was assigned to study the discovery in depth. News of the excavation spread to a monastery in the Middle East, where combat monks chose Lucas, one of the best students in the temple, to fight the devil. At the same time, the servant is attacking Karen to seize the key to save his master Satan. Lugas rescued Karen in time and drove the servant away. At this time, Karen was surprised to find that the demon servant would not die.