A girl falsely carrying the title of honor student and demon. In order to take back past days this contract has been formed―― Snow white wings shining in the night sky. Countless lightning strikes raining from the sky. The powers that cause these paranormal phenomena are referred to as ≪Kyoui≫. -Special ability control Academy- A institution meant to protect and educate ≪Observers≫, girls who carry unique powers. But in reaility, it's a place where these girls are being isolated, controlled and in the end, put to use. Shimon is acting as a honor student and aims to become a supervisor so he can investigate a childhood friend of his, who has been brought to one of these prison academies and had her everyday life stolen. One day he forms a contract with a girl carrying the title of a demon 『Asmodeus』, a subordinate of the institution and――. I will definitely come and save you, even if i have to make the entire world my enemy. (Source: MF Bunko J, translated)

London, the city of magic. In this city shrouded by mist, Elliott and his assistant— "No, wait. Super cute assistant. It's important to Alicia-chan,“—and his super cute assistant Alicia, made a name for themselves as the only ”detective with a wizard's license" in the British Empire. Usually, wizards don't take on detective jobs. It's all to find his missing brother and restore Alicia's life as Angelica. Three years ago, she was killed by Elliott's older brother. It was a magical murder that erased every trace of her existence from the world. To save her, Elliott broke a taboo, and then… lost his magic. In the blood-stained room, he swore. “I'll give my soul to the devil if I have to, but I will bring her back.” (Source: Dengeki Bunko, translated)