Episode 251 of One Piece reveals why Robin abandoned the crew. Iceburg explains to Nami that she surrendered to save her friends from a Buster Call, while the foremen send the Going Merry adrift to sink.
Chopper carries Paulie and Iceburg out of the collapsing, burning building and drops outside before passing out. Iceburg then makes it plain to Nami that Robin's goal was always to let the rest of the Straw Hats escape the island unharmed. To do that, Robin handed herself to the government to help recover the blueprints and to be executed afterward. Nami hurries off to tell Chopper so they can gather the others. Elsewhere, the foremen release the Going Merry, leaving the ship to be destroyed out at sea.
Usopp briefly demands the agents free Franky, then folds under Lucci's glare and is easily beaten by Kaku, who orders him bound for Enies Lobby. Kaku knocks the Merry off its chains and into the water despite Usopp's tearful protest, and Kalifa lashes the sniper with her thorny rose. Outside, Chopper rescues the captives and collapses. Iceburg wakes, apologizes to Nami for the false accusations, and recounts the conversation in which Robin explained her impossible choice and the looming threat she could not ignore.

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In the recalled exchange, Robin tells Iceburg that CP9 set two conditions: frame the Straw Hats and leave them, then submit fully to the World Government. The decisive blow was the authorization of a Buster Call, an emergency summons of five Vice Admirals and ten warships, granted by Admiral Aokiji. Hearing his name, Robin surrendered to spare the crew. Nami, overjoyed that Robin never truly betrayed them, vows to save her. The anime adds station managers Stevie and Bushon trying to glimpse CP9's faces. It adapts chapters 358 and 359.
Nico Robin did not truly betray the Straw Hats. In episode 251, Iceburg reveals to Nami that Robin surrendered to the World Government to help recover stolen blueprints and to spare her crewmates from a Buster Call.
In episode 251, a Buster Call is described as an emergency summons of five Vice Admirals and ten warships, authorized by Admiral Aokiji, the looming threat that pushed Robin to surrender rather than let it fall on her friends.
In episode 251, the Galley-La foremen release the Going Merry from its chains, leaving the ship adrift to be destroyed out at sea.
Usopp briefly demands the CP9 agents free Franky but folds under Rob Lucci's glare, and Kaku easily beats him and orders him bound for Enies Lobby.
Episode 251 adds the anime-original station managers Stevie and Bushon, who are shown trying to catch a glimpse of CP9's faces.
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View on FandomThis content is original writing by Daddy Jim Headquarters based on the One Piece anime series, manga, and official materials. Episode and chapter references are cited where applicable.
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