Zelda no Densetsu: Kamigami no Triforce

A young boy named Link receives a mental message from Princess Zelda, who is imprisoned in Hyrule Castle. After his uncle instructs him to stay in bed, Link disobeys and follows him to the castle. He discovers his uncle injured and is given a sword and shield to rescue Zelda. Link enters the castle, frees the princess, and they escape through a hidden sewer passage to a safe location.