After dying in a train accident, the protagonist is reborn in another world as Millimos, the youngest prince of a small mountain kingdom. Hoping for a peaceful and carefree second life, he instead finds himself mastering both magic and divine arts, two powers that should never coexist. Before long, Millimos is appointed the nation's marshal and unwillingly drawn into the tides of war. This is the tale of a man reborn as a prince who rises to power and turns the world upside down!