When an ordinary salesman dies in a fatal accident caused by a couple's reckless behavior, his story doesn't end there. Reborn in a different realm as a fearsome dragon with a dark reputation, he becomes a target for both valiant adventurers and malevolent beings. Among these challengers is Kuroe, a determined warrior bent on proving her skills by taking down the notorious dragon. However, after a series of confrontations and setbacks, Kuroe and the dragon, known as "Ja," find common ground during a heartfelt conversation. This unexpected connection leads them to embark on a journey together, braving the unknown. Despite the unlikely nature of their alliance, their brief companionship sparks a chain of comical escapades and memorable encounters across the vast world.