If so this book is for you. if not you can safely skip this "book" and save your brain cells.

This little book is truly "extraordinary" in the literal meaning of the word: it is really something that is uncommon and different from what we are used to see these days.

Amazingly, since it was written by a kid (or, maybe, for this very exact reason), it can be read on several different levels, many of whom not even the author was probably aware of.
As such, it is very difficult to write an objective, serious and useful review since the final rating/judgment will vary greatly according to what you are expecting to find in it.

If you want to read it as a martial arts manual..... well, there is not much to say, you should look somewhere else (let me tell a personal anecdote: a few months ago I went in a large bookstore with a famous kung fu master and he picked up this book. I'll never forget his totally puzzled face after 30 seconds of reading it and trying to understand what kind of book this was!).

This book is about the fun and dramatic experiences and daily life of troubled kid: you can get great fun out of it and laugh loud, but there is also a lot of food for thought, if you want to look for it, and, in fact, I believe this book could even be used at academic level for having a unique insight on kids' psychology (surely even Freud would have been very "pumped" by reading this!) which could be very useful for writing a master thesis on the subject!

Can it be harmful to young and lonely kids? The answer is "yes", nonetheless, 90% of what makes the society we are living in is potentially dangerous too so if something happens, the blame should probably go to the adults who are responsible for them and not to another kid who simply tried to express his troubled world in his own words.

In summary:
If you are a teenager looking for some silly fun.... good! Get this book: you will laugh out loud!
If you are a college student majoring in psychology.... Great! Get this book: you'll find plenty of unique insights on a kid's mind!
If you are a lonely kid who is fascinated by the ancient art of Ninjutsu..... Wonderful! Find a proper martial arts school and start training hard!