Masamichi failed the university entrance exam for second time, lost his part-time job at an izakaya pub, and was hit by a truck. He thought he is the most unlucky person in the world...and that he will die. But the next moment, a mysterious man was standing in front of him. "Be my servant. Work for me, be my prey. If you accept, you'll live. If not, you'll die here." Masamichi didn't have a choice but to say yes, although he never knew what a life of a servant would be like.