The movie is utter shit.

The shojo manga looks like crap too.

The shonen manga is surprisingly refreshing and pretty good.

The original novel was pretty cool, if you don't mind the 2chan speak it's written in, but then again if you're here you might not mind.
Though I don't know if it's translated in any language, and I wonder how well it would translate, with all the 2chan culture it's filled with. I just have the original and kind of am scared of any translations that might be made, since it will be hard to translate all the stuff... even if they go for 4chan equivalents.