Chapter 603 is titled "Keep It In Your Heart"
"Sanji and some cute squirrels make a pie together", requested by NSC Hayao-Scan
The Straw Hat Pirates are finally on their way to Fishman Island! After Nami explains the properties of a coated ship, Franky reveals why Hatchi was not there to guide them. As it turns out, the Marines discovered the Thousand Sunny and tried to claim it, with Duval and Hatchi sustaining heavy injuries in the ensuing battles. Franky also reveals that before Bartholomew Kuma was fully converted into PX-0, he made a deal with Dr. Vegapunk to secretly program him to protect the ship until the return of one of the Straw Hats. As such, the Straw Hats are deeply indebted to Kuma for not only saving their lives but for protecting their ship as well. The chapter ends with the Caribou Pirates in pursuit of the unaware Straw Hats.
- A younger Roger is seen for the first time and bore an uncanny, near-identical resemblence to Luffy.
- It is revealed that Roger was a previous owner of Luffy's straw hat. If he was the original is still to be stated.
- Caribou is revealed to have an unknown Logia ability.
- It is revealed that Bartholomew Kuma made a deal with Dr. Vegapunk, in which he was secretly programed to protect the Thousand Sunny until the return of one of the Straw Hats.
- The faces of Fake Sogeking and Fake Franky (who was wearing shades) are fully shown.
- Apparently all the pirates recruited into the Impostor Straw Hats (except for Caribou, Coribou and their crew) were captured by the Marines.
- For the first time, Chopper and Usopp are seen beating up Luffy and Zoro much like what Nami used to do.
- The Caribou Pirates reveal that they were planning on killing the Strawhat Pirates from the start, presumably to make a name for themselves. This was the only reason they considered joining the crew.
- Caribou is the first Logia-class Devil Fruit user to be seen after the timeskip.