Haki is a mysterious power that is found in every living being in the world. It is not that different from the normal senses. However, most people do not notice it or fail to awaken it. Broadly, there are two types of Haki common to everyone, given the proper training; however, there is a third type that only a certain group of "chosen ones" are said to possess. In simple terms, Haki is an ability to sense spiritual energy and overpower enemies.
One Piece (ワンピース Wan Pīsu?) is a Japanese 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. One Piece follows the adventures of a young boy named Monkey D. Luffy, a young boy whose body gains the properties of rubber after unintentionally eating a Devil 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 One Piece in order to become the next Pirate King. reference: One Piece Wikipedia
One Piece Movie Film
One Piece is the first animated feature film of the franchise, starring Mayumi Tanaka as Monkey D. Luffy, Kazuya Nakai as Roronoa Zoro, Akemi Okamura as Nami, and Kappei Yamaguchi as Usopp. The legend of the Great Gold Pirate Woonan remains intact, years after his disappearance. Many pirates search for his mountain of gold hidden on a remote island. Among them are Captain El Drago and his men. By hunting down every member of Woonan's former crew, they eventually take possession of a map to that hidden island. On their way there, they meet and decide to rob the Straw Hat Pirates, who, still lacking a cook, are close to starvation.