He once was a mighty king, but that is all over when he suddenly dies. Without knowing what’s happening, he is reborn – as a baby! Despite having a new identity, Arthur Leywin, he kept the memories of his former life. And although he is, for now, a baby with a small and weak body, he tries everything to get along in this new world full of magic and to get strong as fast as possible. Already at three years old, he is stronger than most of the population, but that’s not all: over the years, he’s getting stronger and stronger, finds out more about the world, forms new bonds … and yet he tries not to stick out too much. But how long will that work out? How strong is he going to get on his journey? And why was he even reborn in this other world?