Having become rich and prosperous in the previous game by collecting treasures, Torneko eventually recovered the "Joy Chest" from the very bottom of the dungeon and had it enshrined at his shop. Peace had returned to the town for some time. After awhile, a mysterious stranger arrived and seemed concerned about the Joy Chest being outside the dungeon. At the same time, monsters started reappearing and different parts of the kingdom began turning into "mysterious dungeons". It will be up to middle-aged Torneko, to fight through these strange places and help the king discover what has broken the peace.