Steve, a young man who is ordinary in the modern world (or has a slightly special background, such as a naval history enthusiast and a fighting game player), died unexpectedly and was reborn as Monkey D. Luffy in the world of "One Piece". He has Luffy's body and rubber fruit abilities, but at the core are Steve's memories, way of thinking, and some modern knowledge. Key point: He knows the "original" plot, but this is both an advantage and a huge psychological burden and source of variables.