Adele, a 12-year-old girl of Chinese descent, never imagined that the title of "Tenth Noble" would disrupt her quiet daily life studying Western European occultism. When a man in sunglasses awakened her bloodline with an ancient tongue from another world at Tokyo's Haneda Airport, a rift in space and time had already begun to tear open. The instant she fell into a pond, the reflection on the glasses of Murata Ken, an elementary school student and reincarnation of a sage, flashed with memories of his past life. What seemed like a chance encounter would bind the two worlds together.
When Adele awoke in a castle in the clouds in the Demon Kingdom, her dark eyes met those of the blond, blue-eyed Wolfram, who was arguing with Shibuya Yuuri. The high school student demon king, who had been flushed into another world through a toilet, was now slamming his hand down over a plan to form an alliance with humans. His collar was still dusted with sugar from the yokan Gwendal had fed him that morning. The minister of military affairs paused in his knitting of a woolen teddy bear. A scroll of earth magic slipped from his sleeve and caught Adele just as she stumbled.
"Welcome to the demon king's afternoon tea party." Junda, a wind mage, glided over with a teapot in hand, his violet hair brushing the contract mark on Adele's forehead. The crystal that had shattered when Julia died twenty years ago was now resonating in the girl's arms. Watching from the shadows, Adalbert clenched the rebel insignia in his fist. He would never let the newly awakened Tenth Noble upset the balance of power again.
When Yuuri's demonic power resonated with Adele's ancient bloodline, mysterious runes suddenly appeared in the account books of the Kabenikov Trading Company. The golden whip of Queen Jenevieve sliced through the ceiling of the council chamber, while the prophecy scrolls left behind by the three great witches joined together amid the chaos of space and time. Deep within the altar of the True King, the "Mirror of Four Souls" that sustained the two worlds was crumbling. The modern girl and the toilet demon, forced into a symbiotic pact
