One Piece: Heart of Gold  

ワンピース ～ハートオブ ゴールド～, ONE PIECE 〜ハートオブゴールド〜

Olga, a young woman with knowledge of Pure Gold, faces pursuit from two sources - the government and a person known as Mad Treasure. She eventually joins forces with the Straw Hat Pirates in their quest for Pure Gold on Alchemi Island, which lies within Bonbori, a large angler fish in the stomach of the ocean.