If you're looking for anime similar to One Piece: Episode of Merry - Mou Hitori no Nakama no Monogatari, you might like these titles.
After Nami steals the Going Merry, Roronoa Zoro, Usopp, and later Monkey D. Luffy and Sanji set after her and wind up in Cocoyasi Village, Nami's hometown ruled by the tyrannical fishman Arlong. It is here that Nami's past and true motives come to light.
Chopper and Sanji look back on Zoro’s battle against King the Wildfire, a Lead Performer of the Animal Kingdom Pirates. They explain how Zoro struggles to find a way to defeat the seemingly invincible King.
Captain Kid and Killer look back on their adventures in the Land of Wano along with the other pirates from the Worst Generation, Luffy, Zoro, and Law. They describe how hard the five of them fought against the Emperors of the Sea, Kaido and Big Mom.
As the world anticipates the legendary diva Uta’s show in Elegia, the Red-Hair Pirates are making some disturbing moves. Koby remembers how Shanks ended the Paramount War at Marineford.
Luffy and his crew meet a descendant of Noland the Liar, who tells them how to reach Sky Island. There, a strange and incredible country awaits, so long as the Merry can survive a wild ride to the sky!
In a golden age of pirates, one young rookie namedMonkey D. Luffy is taking the world by storm. Setting out from his hometown in a small boat, Luffy is slowly gathering together a crew of strong friends to help him achieve his goal: to become the king of the pirates! Using his powers as a rubber man and relying on the strong bonds with his crewmates, the Straw Hat Piratestraverse the treacherous seas of the Grand Line battling tough enemies, preventing revolutions, exploring islands in the sky, and declaring all-out war against the world government. However, catching the eye of the marines has its price. With the full force of the navy on their tails, will Luffy and his friends make it to the second half of the Grand Line, let alone attain their dreams?