To complete the "Giant's Request" mission in "One Piece", you can follow the following steps:
Answer: After getting the juice, just give it to Brocky.
1. First go to the top of the map to find Giant Dolly and talk to him to receive it.
2. Then go to the left side of the map and investigate a wooden barrel to get juice.
3. Finally, go to the south to find Broki, next to the coconut tree, talk to him to complete the task.
The above is all about how to complete the giant's request mission in "One Piece". For more game guides, please click on the source code website.