It is rare to see a manga when you get an actual father with children as a protagonist. Despite being labeled as shounen it features some mature themes that are more suited for seinen (like raising and protecting children). It sometimes switches the mood between being goofy and being deadly serious, especially in the later chapters. The story goes almost nowhere for 50+ chapter and then suddenly starting to develop as more key figures are introduced. But what it is a lot more interesting is how the main protagonist handles the situation that he gets himself in. The author try to portray the protagonist in somewhat realistic way, despite it being in a fantasy world. I love mangas where author tries to give his characters some depth.