Shiren the Wanderer and his companion, Koppa the talking ferret, return for an all-new roguelike dungeon crawling adventure on Serpentcoil Island! After receiving a vision of a mysterious girl held captive by a terrible monster, Shiren and Koppa make their way to Serpentcoil Island—a distant isle rumored to be the lost stronghold of treasure hoarding pirates. Determined to rescue the girl and find the treasure, the two race into danger… only to be soundly defeated, like all the others who tried before.

Undeterred, Shiren and Koppa vow to challenge the monster again in order to save the mysterious girl. To brave the many dangers that await them, Shiren and Koppa must traverse complex dungeons filled with hostile monsters, hidden traps, and useful items. All the gear and experience Shiren accumulates will be lost if he collapses during exploration, so beware of rushing in unprepared! Rescue the mysterious girl and uncover the mystery that clouds Serpentcoil Island!