A girl with dragon horns that Rimuru, a 12-year-old boy, secretly "purchased" from a slave trader has amazing powers and secrets. A story about a boy named Rimuru, accompanied by a half-dragon girl, who sets off on a journey to change the world! A long-awaited comic adaptation of the ambitious sister work of the original author's popular work ``A hero who is reborn as a hero's daughter aims to become a hero again'', which is set 500 years ago!