The Straw Hat Pirates enter the rough seas of the New World in search of the hidden treasures of the Pirate King, Gol D. Roger－One Piece. On their voyage, the pirates come across a terrifying, powerful man, former Marine Admiral Z.

Z is accused of having stolen the "Dyna Stones", weapons believed to have the power to shake up the New World. The Marine Headquarters believes Z is about to use it to end the pirate era, and with it, the lives of many innocent people. In fear of such a phenomenal event, marines start to take action against the former admiral.

Even if it means stumbling upon marines and the navy, the Straw Hat Pirates decided to chase after Z and stop him from causing havoc. As they continue to embark on their ventures, the pirates bump into new and familiar acquaintances.

Monkey D. Luffy and his Straw Hat Crew have finally arrived on Gran Tesoro, a ship carrying the largest entertainment city in the world. Drawn in by the chances of hitting the jackpot, the crew immediately head to the casino. There, they quickly find themselves on a winning streak, playing with what seems to be endless luck.

When offered a special gamble by Gild Tesoro—the master of the city himself—the crew agrees, choosing to believe in their captain's luck. However, when they find themselves victims of a despicable scam, the crew quickly realize that there is something darker happening beneath the city's surface.

Left penniless and beaten down, the Straw Hat Crew are forced to rely on another gamble of a plan. With the help of a new friend or two, the group must work to reclaim what they've lost before time, and what remains of their luck, runs out.

[Written by MAL Rewrite]

The world's greatest exposition of the pirates, by the pirates, for the pirates—the Pirates Festival. Luffy and the rest of the Straw Hat Crew receive an invitation from its host Buena Festa who is known as the Master of Festivities. They arrive to find a venue packed with glamorous pavilions and many pirates including the ones from the Worst Generation. The place is electric. (Source: ANN)

The words that Gold Roger, the King of the Pirates, uttered just before his death excited the masses and the world has entered a Great Pirate Era! There is a group of young pirates who are about to set sail on the Grand Line. Monkey D. Luffy, a rubber man. Roronoa Zoro aka “Pirate Hunter.” Usopp, a sniper. Sanji, a seafaring cook. And “Cat Burglar” Nami. They, the Straw Hats, all place a foot upon a barrel and make their vows before their next journey across the great ocean. Luffy shouts “In order to be the King of the Pirates!” A decade ago in the Windmill Village... A little boy Luffy was enthralled with a pirate boss Red-Haired Shanks. But a group of mountain bandits shows up and makes fun of the pirates. “Why didn't you fight them?!” Luffy yells out angrily but Shanks says that it's nothing worth getting mad over. At that time, Luffy snatches the Gum-Gum Fruit from a treasure box and eats it and as a result, his entire body becomes rubber and he loses the ability to swim for the rest of his life! A few days later, Luffy is surrounded by the mountain bandits again and Shanks comes to help. “No matter what the reason, anyone who hurts my friends has to pay!!” Shanks and his pirate crew are incredibly strong and they beat down the mountain bandits. Higuma, the head of the mountain bandits, runs away kidnapping Luffy and heads for the sea. However, they encounter a local Sea Monster there and are attacked. Luffy is in a desperate situation... But again, Shanks saves the day. He outstares the Sea Monster and chases it away but in exchange, he loses his left arm... When Shanks leaves the village, he leaves his straw hat with Luffy. “Come bring it back to me someday! Once you've become a great pirate!” 10 years later, Luffy has grown up strong and he sets out for an adventure on a small boat. He again encounters the local Sea Monster for that fateful day. However, Luffy takes it down with a single blow of Gum-Gum Pistol. Luffy’s journey to become the King of the Pirates now begins! (Source: Crunchyroll)