As the Straw Hat Pirates prepare to finally enter the Grand Line, they each reflect on the many adventures that brought them here.

Zephyr, now known as Z, rides the seas with only one goal: Destroy all pirates and their dreams at becoming King of Pirates. When Luffy and his crew encounter him at sea, not only are they utterly defeated by the man with an arm made of Seastone, Nami, Robin, and Chopper are turned 10 years younger due to Z's minion Ain. Luffy is so determined to win against him that he does not even notice Z's master plan that could sacrifice thousands of lives.

In this animated adventure, a young witch moves away from her family to practice her craft, but she finds that making new friends is difficult.