Amila, daughter of a feudal lord, watches the capital of her home kingdom fall to a demonic invasion. Now the same evil forces are marching toward her father's territory — and her father has disappeared. With no army, no allies, and no time left, she turns to the only option remaining: a forbidden relic her mother left her. The relic is an incubus-possessed sword that sustains itself by feeding on the life energy of those around it. Using it will cost her something. Not using it may cost her everything.