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River King: Mystic Valley Box Art

Journey to rivers, swamps, and ponds as you look for the mysterious River King to help your younger sister wake from her unexplained slumber. It will take all of your fishing skills to catch the elusive River King!

Your little sister Yunna was never a light sleeper, but you knew that there was something wrong when you couldn't wake her up this morning. Your friend Sasara knows plenty about fish, bugs and flowers, but she doesn't know if Yunna's slumber is from an illness or mysterious spell. What she can tell you is that the scale of the legendary River King is the one thing that will rouse your sister from her prolonged slumber, although finding the River King is almost as impossible as actually landing the magnificent fish. Local anglers have spent lifetimes and entire fishing fortunes looking for this rare beast, braving the challenges of rushing rivers, bottomless lakes and murky swamps. But you are not alone on this adventure, make friends with the magical creatures of Mystic Valley and unlock their special abilities to help you. It will take all of your fishing skills to catch the elusive River King!

As of May 20, 2014, the Nintendo Wi-Fi Connection service for Nintendo DSi and Wii systems has been retired. Online features of this game are no longer available after this date but this game still provides an entertaining experience in offline mode.

To learn more about this service change, please visit To learn more about this service change, please visit

  • Collect fish, bugs and flowers and sell the items to buy new tackle!
  • Open hidden trails to flowing rivers, placid lakes and towering waterfalls!

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Game Details
  • Platform Nintendo DS
  • Release Date Mar 11, 2008
  • No. of Players 1 player
  • Category Role-Playing, Adventure
  • PublisherNatsume
  • DeveloperMarvelous Inc.
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