I bought this book last year (or was it last two years?). The art in this book is nice (shoujo-ish big eyes..etc) This book contains different stories on how the girls in the stories were being bullied. If you don't mind repetitive stories as you read on then I recommend this.
For me, I rate it a 5/10 for it's art. I personally don't like this kind of story plot and kind of regretted buying it. XD It's a bit cliche but well, since this is a story of bullying so, i'll just let it pass.
Try to avoid this if you don't like weak girls or something like that.
Spoiler (highlight to view)
Because you'll be seeing stories like : The main girl's friend left her because of those bullies./ bullies vandalized main girl's table.. etc. It get boring over time.