One Piece: Grand Battle! is a fighting game made in Japan based on the Anime and Manga series One Piece. It is the fourth game in the Grand Battle series.
There are four different modes in the game: Grand Battle, a one-player/two player mode that features unlocked fighters and stages; Story Mode, a mode that follows every character through the story; Training, a testing mode to test one's skill; and Tourney, a tournament mode that allows to select a character and fight in it and a baseball mode
Source: Wikipedia, "One Piece: Grand Battle!", available under the CC-BY-SA License.
From back of box
7 Colourful stages full of crazy gimmicks. Pick up and use objects to fight your foes.
Choose from 16 one of a kind wacky pirates and 32 support characters - each with more than 20 regular moves.