Having finished his stay in the royal capital for now, Tenma returns to Sagan with a team of powerful companions to challenge the dungeon once again. But this time, Sagan's dungeons are teeming with more formidable monsters than ever before. He and his party find themselves in trouble when a monster creeps up from the depths, overwhelming even Valley Wind! To add to the chaos, they receive a visit from the king, who just loves surprises...

Tenma's journey reaches new heights (and depths!) as the Dungeon Revenge arc begins!