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

One Piece, Vol. 10: OK, Let's STAND UP! is the tenth collected volume of Eiichiro Oda's pirate adventure manga, published in English by VIZ Media on April 4, 2006. It gathers chapters 82 through 90 and sits at the heart of the Arlong Park arc, the storyline that spans volumes 8 to 11.

The volume opens on a revelation that reframes everything the crew thought they knew about their navigator. Nami has been working all along for the fish-man pirate "Saw-Tooth" Arlong, stealing treasure in order to buy back her home village — and Arlong has repaid her by handing her fortune over to the Navy. With her plan in ruins, Luffy and his crew commit to a fight against the most ruthless opponent they have yet faced. The battles run almost end to end: an injured Zoro takes on the six-sword-wielding Hatchan, Sanji turns his kicks against Arlong's fish-man fighters, and Luffy, trapped and unable to swim, has to be freed by his own crew before he can face Arlong himself.

This is the emotional turning point of the early series, resolving Nami's backstory and settling her place among the Straw Hat Pirates. The English edition runs 192 pages, carries a Teen age rating, and reprints material first serialised in Shonen Jump.