A young boy named Trafalgar D. Law is trained by the gods to be a powerful fighter and guardian of the universe. He gains great power and works to help those in need. However, a great evil warrior builds an army and wages a five year war against Law. In the end, Law is victorious and establishes a law forbidding war. His power creates a portal to a dangerous parallel universe. Law has a son named Luffy who inherits his power but cannot control it. After Law's death, Luffy must embark on a journey to seal away his father's power in the realm of the gods of death to prevent it from falling into the wrong hands.