The premise behind this book is really interesting. Essentially, it posits that a supernova gives everyone over the age of 13 radiation poisoning, and they all die. Only children 13 and under are left in the world. It's like Miri, a Star Trek episode from 1966, except on a global scale, and with a full-length novel to flesh out the idea. Unfortunately, the execution doesn't fulfill the promise of the idea. We can argue whether a children's world would really turn into a "Candytown" free-for-all, or if children would really start massive war games over Antarctica, with actual casualties. I didn't find either very likely, but I respect the imaginative process that went into creating those scenarios. My problem was that the writing/translation is very clunky, making the children's world hard to read about, even if I could get behind the ideas.