User blog comment:Grievous67/One Piece to become the best selling book series of all time????/@comment-1940096-20150708180437/@comment-5690257-20150708191837

It depends of how people consider it and many people don't call it the same, but honestly this is my point. You read both of them. I consider them in the same category.

Even if you don't consider it a book, if it topples Harry Potter it will become the most succesful fictional work of all time, book or not