This would certainly be a cool starter book to browse through before starting the manga, if you were looking for a little bit more clarity on the characters and story.
Overall, however, I found the layout strange. The western style read (front to back) didn't mesh with the occasional manga-style page read of right-to-left. I found the translation/narration confusing as well - in one part of the page it would be third person explanations, while an adjacent paragraph would explain something else in first person (with no clear marker on who the narrator was unless you really knew the story - ie - someone talking about "My brother Al" is clearly Ed, speaking).