Chapter 658

Chapter 658 is called "Biscuits Room".

Cover Page
From the Decks of the World Vol. 40 - "Wandering Thriller Bark - Found Kumashi".

Short Summary
Sanji, Chopper, Nami, and Franky decide to rescue the children found in the room, forcing them to fight the mysterious group of people in the hazmat suits. While this is going on, the leader of the group, a mysterious liquid blob, finds out about the approaching Marines and wonders about Vegapunk's involvement. Meanwhile, Zoro, Usopp, and Robin talk to Brook, who has escaped his captors and found a huge building, and Luffy finds and fights some centaurs. Smoker then states that Punk Hazard was the site of Akainu and Aokiji's decisive battle for the position of fleet admiral two years ago.

Chapter Notes

 * Kumashi is seen for the first time since the timeskip.
 * Perona returns to Thriller Bark and finds Kumashi.
 * The samurai's son is named Momonosuke.
 * It appears that the people in gas masks kept all the kidnapped children in the "Biscuits Room", away from their families. They were brought in to cure a certain sickness they had or at least were told that.
 * Brook is still on the Thousand Sunny, which has been taken to the frozen side of Punk Hazard in front of a huge building with PH-008 written on it.
 * What appears to be the leader of the people with gas masks is seen for the first time. It seems to be a strange, formless creature whose body is entirely liquid. Whether this is its natural form or a Devil Fruit ability is unknown.
 * Luffy, Zoro, Usopp, and Robin meet two centaurs, one with leopard legs and the other with giraffe legs.
 * The mysterious bird-lady that Usopp saw earlier is revealed to be part of the same group as the centaurs, and is seen communicating with them on a Den Den Mushi regarding the intruders.
 * Luffy has dubbed the disembodied legs "Leggy".
 * Smoker's ship has arrived on the island.
 * Punk Hazard is revealed to be the island where Aokiji and Akainu fought two years ago, explaining the two halves of the island. It is also revealed that Punk Hazard was a wasteland even before the admirals' battle, because one of Vegapunk's chemical weaponry experiments went wrong four years ago.

Trivia

 * Brook's pre-timeskip personal Jolly Roger is seen on the side of a teacup he is drinking from.