The two brothers are shown to be romantically interested in a young woman named Marian, a student in their dojo. The arcade version of the first game (along with most console versions) can end with both brothers fighting each other over Marian if two players reach the end together, with the survivor ultimately winning Marian's affections. The Famicom/NES version, which establishes Marian to be Billy's long-term girlfriend, changes the story so that Jimmy was actually the leader of the Black Warriors (a change made as a result of the lack of two-player cooperative play in that version) and was the one who orchestrated Marian's kidnapping.