It has been over 300 years since the massacre and a tentative truce between angels and demons is in effect.
143-year-old Aleks is an officer in one of the strongest and largest legions of angels in the world. His world is relatively peaceful, only needing to deal with the occasional demon that goes out of hand.
That all changes when one of the most powerful demons in history decides to share his girlfriend's body. This demon, known only by the number 7, is ruthless, cruel, clever, powerful beyond reason, and is looking to recruit.
Boredom is a dangerous thing without morals or inhibitions. She has found every weakness and is determined to create an 8th. But to make a demon you need to break an angel. The only question is how to go about it.