Serving The Vampire Duchess With A Butler System

In a medieval world filled with war and magic, a man is reincarnated as a butler for the Duchess of the Aetherius Empire after selling his memories to god. He quickly discovers he has a knack for it and enjoys his role. He also grows in strength the more he does things like cleaning, serving and disposing of people. As he travels through this magical and dangerous world of magical races and empires. He must use his skills and strength to navigate the political and dangerous intrigues and serve his master well.