I grabbed quite a few manga novels at one point because I'd so enjoyed the D.Gray-man novel, Reverse. Alas, this did not live up to that at all. It's the novelisation of one of the One Piece movies and as OVAs and films of manga and anime often are, it's vaguely AU. It takes place just after Chopper joins Luffy and the others, but Vivi is not on the ship with them for this adventure. The plot here is that the crew sets sail for an island that's supposed to have a great treasure, only when they land there, Chopper gets separated from the others. The island turns out to be inhabited by weird animals and a little boy named Mobambi, and they mistakenly think Chopper is their new king. Of course a baddie appears and lots of fighting happens and stuff. It was a fun enough read (and very quick), but not anywhere near as good as the manga itself.