Because Go Go Nao-p! Vol.2 English edition has been released (at last!), I set vol.1 free. From today 23th to 27th, the book is free on Amazon.
Although the 4koma which vol.2 has less than vol.1 has, it has some extra illustrations/sketches, from my other works. (Mizuki, Nozomi, Moon and Blood etc.)
Go Go Ｎao-p! vol.2
I hope you enjoy!