One Piece Omnibus Edition manga volume 13 includes volumes 37-39 and features story and art by Eiichiro Oda.

In Water Seven, a serious seafarer's city and one of the last stops in Paradise, Luffy and his Straw Hat crew come up against competing sets of assassins, each seeking the plans for Pluton, one of the ancient world's most powerful weapons! Newest Straw Hats member Nico Robin may have the blueprints, but she's been spirited away on the speeding Sea Train... and may be on the run from the Straw Hats themselves!

One Piece Omnibus 13 collects volumes 37-39 in omnibus format.