One Piece Log: Fish-Man Island Saga

Across the Red Line, there was a Submerged Kingdom which is famous as Fish–Men Island. Hody Jones was a radical fishman there who controlled all the humans on that island with his powerful drug. He and his fishmen torture humans there and do any wrong. Luffy and his crew pass that island and then Luffy decides to stay there until he sets those people free. Then they all fight against Jones and try to free Fishman and bring peace there.