One Piece

One Piece (Wan Piisu) is a Japanese shōnen manga series written and illustrated by Eiichiro Oda. It has been serialized in Weekly Shōnen Jump since August 4, 1997; the individual chapters are being published in tankōbon volumes by Shueisha, with the first released on December 24, 1997, and the 67th volume released as of August 2012. One Piece follows the adventures of Monkey D. Luffy, a young man whose body gains the properties of rubber after inadvertently eating a devil's fruit, and his diverse crew of pirates, named the Straw Hat Pirates. Luffy explores the ocean in search of the world's ultimate treasure known as the One Piece and to become the next Pirate King. Along his journey, Luffy makes several friends and battles a wide variety of villains, many of whom try to kill the Straw Hats.

List per Season/Arc:

Fishman Island Arc: [on going] latest Episode 564 (523-541 and 543-?) 

Return to Sabaody Arc: Episode 517-522, 6 episodes

Post-War Arc: 490-491 and 493-516, 26 episodes

Marineford Arc: 457–489, 33 episodes

Impel Down Arc: Episode 422-425 and 430-452, 27 episodes