In the afterward, Osamu Tezuka himself says "In my own opinion, I have never done a series as poorly as this one," and I have to agree. It meanders all over the place, nonsensical plot twists just pop in out of nowhere, and there's no real focus. It's actually kind of hard to follow despite trying to be a simple children's action/adventure series. There are bits and pieces that work on their own, and Tezuka's art, even this early, is always a delight, but there are far, far better Tezuka books you can get. For Tezuka completionists only.