This world has been ruined, after all, the most magically advanced race magically nuked the world, sending all others to hide in the ancient dungeon, simply named 'The Caverns' The only reason everyone has survived is from the classes they have gained from the dungeon, the mages with familiars to help defend, even managing to tame the 3 lower cavern bosses, 2 of controlling their minions, one with the strongest magic in the world, yet the one that couldn't be tamed was the Upper Caverns Boss, due to it being physically superior to it's fellow bosses, able to run and creep away when in danger, yet the fateful day, where a young, sickly mage girl was searching for her familiar, the one who would defend her place in this world, the one who'd let her move to the future. . .