This free game is about a doctor who goes back to the medieval times to experience the evolution of medical science. The doctor is a character named Dr. Chatelet. He graduated from medical school and firmly believed in the correctness of traditional medicine. He was an extremely talented and highly educated man. However, with the experience, he has witnessed many situations that cannot be explained by traditional medical theories, such as patients dying unprovoked and the inability to stop bleeding. In the face of these situations, he has a choice of whether to believe in the truth of modern medicine or not. The doctor decides to believe and follow the new medical methods that he has learned.