Chise Hatori is a 15-year-old girl. She has no family, no special skills, not even any hope for her own existence. One day, she is handed over to a magician, a non-human creature whose origins date back to ancient times... He takes her under his protection to train her as his apprentice, and reveals that she will eventually become his wife. From that moment on, the gears of her heart, which seemed to have stopped forever, begin to move slowly again...