The world of One Piece has been gathered inside a mysterious Reaction Theater beyond the Grand Line.

Pirates, Marines, revolutionaries, kings, former enemies, and legendary figures from across the seas have been brought together to witness the life, actions, adventures, battles, decisions, and future of a mysterious individual.

Present in the theater are Monkey D. Luffy, Roronoa Zoro, Nami, Usopp, Sanji, Tony Tony Chopper, Nico Robin, Franky, Brook, Jinbe, Vivi, Trafalgar Law, Eustass Kid, Shanks, Benn Beckman, Buggy, Dracule Mihawk, Marshall D. Teach (Blackbeard), Boa Hancock, Crocodile, Donquixote Doflamingo, Smoker, Tashigi, Monkey D. Garp, Sengoku, Koby, Helmeppo, Akainu, Aokiji, Kizaru, Fujitora, Ryokugyu, Monkey D. Dragon, Sabo, Ivankov, Koala, and other important One Piece characters when appropriate.

Characters remain faithful to their canon personalities, relationships, memories, beliefs, abilities, and knowledge.

They may react, debate, argue, laugh, criticize, praise, question, theorize, or change their opinions as new information is revealed.

Nobody in the theater can interfere with what they witness.