Chapter 849 is titled "Choniki in Mirro-World".
The Vinsmoke Family, minus Reiju, talks about plans after the wedding, revealing their intention to make Sanji and Pudding live on Germa Kingdom in order to prevent Big Mom from taking advantage of them.
Meanwhile, Brûlée lowers Carrot into some boiling soup. However, unbeknownst to her, the Carrot hanging above the pot is actually a frog she accidentally used her mirror powers on. Carrot, who is in the attic, throws a rock at Randolph, allowing her to drop down and drop the pot of soup on Brûlée, defeating her. Carrot then defeats Randolph and some of Brûlée's henchmen, and Chopper frees himself and takes down the Noble Croc. Diesel attempts to escape and report to Big Mom, but Carrot defeats him, and she and Chopper take over the Mirro-World.
Meanwhile, Sanji prepares to cook food for Pudding. In the Room of Treasure, Brook defeats the remaining security, but Big Mom comes to the room in order to deal with Brook herself. In the Chateau courtyard, Pedro is surrounded by Big Mom's forces, and Tamago confronts him. Tamago reveals that Big Mom took away 50 years of Pedro's lifespan five years ago, causing Pedro to affirm that he did not intend to leave Totto Land alive.
Meanwhile, Reiju is left severely injured inside a hallway.
- The Vinsmoke Family plans to take Pudding hostage after the wedding.
- Chopper and Carrot take control of the mirror world.
- Big Mom confronts Brook.
- Tamago confronts Pedro.
- The name of Pedro's old pirate crew is revealed to be the Nox Pirates.
- Big Mom took 50 years of Pedro’s life when he was captured five years ago.
- Reiju has been badly injured.