In Ero Ero No Mi - The great adventure, your character is a little boy who discovers an Akuma-no-Mi (One Piece) locked up in a trunk, but it doesn't have any powers yet, In time, your mom gets kidnapped by pirates, and is gone from your life forever. Heartbroken, you join the Marines to try to find justice for your mom and somehow rescue her. But the Marines don't provide that justice, so you join the pirates. You command a group of them and try to find your mother to finally get justice for her and along the way, you'll find that Akuma-no-Mi you found as a child will help you as well as bring you some lovely ladies.