In the grim underbelly of New York, Ash Lynx, a former pawn of the mafia, now leads his own gang with a steely resolve, haunted by his violent past. Eiji Okumura, a young Japanese photographer, crosses paths with Ash while on assignment, drawn to the enigmatic teenager. As they delve into the enigmatic 'Banana Fish' drug plaguing the city, a perilous journey unfolds, forcing them to confront their demons and fight for a future free from darkness.