One Piece
Once upon a time, "The King of Pirates", Gol. D. Roger attained all things the world had to offer. As he was being executed by the marines, he gave a speech regarding his treasure, which he left on an island in the Grand Line, the treasure titled the "One Piece". Many pirates wish to claim the 'One Piece'. This has caused what is called "The Great Pirate Era". Then, a boy living in Foosha Village, Monkey. D. Luffy, made friends with "Red-Haired" Shanks. Shanks is a powerful pirate, given the title of Yonkou (Four Emperors, consisting of four of the strongest pirates) staying in the town. During his stay, the town was attacked by pirates, which were defeated quickly after. One day, Luffy ate a Devil Fruit called the "Gomu-Gomu no Mi" (Gum Gum/Rubber Rubber fruit), giving him the ability to stretch like rubber, in exchange for taking away his ability to swim. At one point, Luffy made bandits angry, so they threw him into the sea. Luffy was nearly eaten by a Sea King, a sea monster similar to a Sea Serpent, but Shanks helped him, losing his arm in the process. When Shanks left Foosha Village, he gave Luffy his straw hat. In exchange, Luffy had promised Shanks to become the King of the Pirates and deliver him his straw hat.