This is the story of a youth named Alex, who owned a dungeon, becoming the frst ever 'Dungeon Master' from the human race. After this carefree young master decides to reach the peak of his world, along with the humanoid dungeon core, Lucy, who can keep him away from his destiny as he journeys forward uncovering the mysteries behind dungeons and enhances the strength of both his dungeon and himself. Watch the rise of a youth who only cares about things and people that could be described through the word 'My', as he conquers other dungeons and defeats dungeon masters and goes on to establish his own empire.