Ankoku Shinwa: Yamato Takeru Densetsu (1989)

The game is based on old Japanese legends about Yamato Takeru, a legendary hero of ancient Japan. The game starts when Yamato Takeru is a thirteen-year-old boy. His father was killed under mysterious circumstances. Searching his things, the boy found a postcard that gave him his first clue for the investigation. From that moment, his adventure begins.