Chapter 644

Chapter 644 is called "To Zero".

Cover Page
From the Decks of the World Vol. 27 - "Jaya - South Bird ♥ North Bird → West Bird & East Bird".

Short Summary
Noah continues falling toward Fishman Island while a flashback of Hody's appears. In the Fishman District, Hody and the New Fishman Pirates officers were taught as kids that the humans are an inferior species and they should be punished by heaven. The flashback moves forward in time when Hody was a Neptune Army member and he and his crew commit crimes, celebrate the death of Otohime, and start producing Energy Steroids and the flashback ends. Fukaboshi gives an emotional speech to the whole island about the cause of this event and begs Luffy to create a new beginning. Luffy then tells Fukaboshi to leave everything to him and his crew. After the discussion ends, Hody catches up to Luffy and Shirahoshi and Luffy punches him with an exploding punch.

Chapter Notes

 * There are north birds, east birds, and west birds in addition to south birds.
 * The past of the New Fishman Pirates is revealed
 * The air bubble succesfully goes around Noah.
 * For the first time, Luffy uses a Gear Second attack without saying "Jet" in its name (because it is an attack which is impossible in his normal form: it is not a jet version of an attack).
 * Luffy's attack, "Gomu Gomu no Red Hawk", is quite similar to Ace's attack, "Hiken".
 * In one of the panels, the New Fishman Pirates are shown burning another fishman's house for helping a human. This is similar to how the Ku Klux Klan burned downed other Southerners houses during the Civil War for helping the blacks that were being discriminated against.
 * It is revealed that Zeo is a chemist, as he was the one Hody had replicate the drug.