One Piece, Vol. 10: OK, Let's STAND UP!

Nami, the navigator of Luffy's crew, has been working for the fish-man pirate "Saw-Tooth" Arlong all along. She has been stealing treasure to buy back her home village. Arlong now turns her saved fortune over to the Navy, and her plan collapses.

Luffy and the rest of the crew choose to fight, even though Arlong is the most ruthless enemy they have faced so far. Most of the volume is battle. An injured Zoro takes on Hatchan, who fights with six swords, and Sanji turns his kicks on Arlong's fish-man fighters.

Luffy is trapped and cannot swim, so his own crew has to free him before he can face Arlong himself.

This is the tenth volume of Eiichiro Oda's pirate adventure manga One Piece, collecting chapters 82 through 90. It sits in the middle of the Arlong Park storyline, which runs from volume 8 to volume 11. The volume settles Nami's backstory and her place among the Straw Hat Pirates, which makes it an emotional turning point for the early series. Fights follow one another almost without a break.

The English edition from VIZ Media runs 192 pages and carries a Teen rating. The chapters first appeared in Shonen Jump.