Dungeon Dungeon : Survival

Long ago, the dungeons unleashed endless hordes of monsters that drove mankind to the brink of destruction. Until one day, brave heroes with powerful skills sacrificed their lives to seal the dungeons away, bringing peace to mankind. Hundreds of years have passed since then. Now, the seals have weakened, and one by one the dormant dungeons have begun to awaken... You, who now bear witness to this tale, your eyes remind me of the heroes of yore...