A mage, lacking both talent and lineage, is burned to death by the magic he loves. He's reborn as Lloyd, seventh prince of the Saloum Kingdom, with his past memories intact. One day, in a forbidden library, he awakens a demon that wields ancient magic...

After making the Demon Grimoire his familiar, Lloyd sets out in pursuit of a dungeon with magically enchanted items and encounters Tao, a martial artist who uses Qi techniques. Lloyd assumes the alter ego of Robert and heads deep into a dungeon with her.