The world has undergone a great upheaval, and “dungeon games” have begun to appear randomly everywhere. The monsters that emerge carry out bloody massacres against humanity! A chuunibyou manga artist named Qin You has experienced countless dungeons in his dreams—he knows levels, battle experience, and dungeon mechanics like the back of his hand. He believes himself to be the hero destined to save the world! And so, his all-knowing adventure begins!