On the trail of Small Carp, the foursome of Okko, Noburo, Tikku, and Noshin were shipwrecked by a storm near the castle of Satorro. The Masters of the Castle grant them refuge, but they come to wonder about the mysterious atmosphere that reigns there. Why did the sacred spirits desert the castle? Tikku, impatient for some action, decides to inspect the castle and discover what it hides.