River King: Mystic Valley is a Nintendo DS RPG that blends fishing, exploration, and item collecting in the River King series. The story follows a quest to catch the legendary River King and obtain a magical scale needed to wake the hero’s little sister.

• Cleaned, tested, and guaranteed to play. Authentic cartridge.
• Original online services for this game or platform have been discontinued; any offline or local modes still work normally.
• Fishing-focused RPG gameplay centers on landing different catches while progressing through a light adventure story.
• Collected fish, bugs, and flowers can be sold to earn money for new tackle.
• Hidden trails open access to new areas, including rivers, lakes, and waterfalls.
• The game uses a compact handheld adventure structure built around exploration, resource gathering, and upgraded fishing gear.

Mystic Valley continues Natsume’s River King line with a portable entry focused on angling rather than the farming structure associated with Harvest Moon. The legendary River King serves as both the central objective and the story’s cure for the sleeping-sister plot.