Her name is Emma. She is not a person - another creature. No one knows where she came from or who her parents are. She can open any door. And also, as it turned out, portals to other worlds. And now Emma serves on a team of half-breeds no less strange than herself. They are called demon spawn. They are called horny, cruel monsters. Experiments are carried out on them, and they are sent as cannon fodder to those missions where ordinary military personnel are powerless. And half-breeds go, risking their lives for the sake of pure-blooded people. The very ones who despise and fear them. His name is Seimas. He is a half-demon, one of the strongest and the commander of a close-knit team. And also the one who turned the whole world of the girl Emma upside down and made her believe that people like them can love and be loved. And then there are people and non-humans who dream of using Emma’s abilities for their own purposes, manipulating and coercing, depriving them of any choice and the right to choose her own destiny. Will Emma, having gone through many trials that fate has in store for her, be able to maintain her love for Seimas and help her friends find a world in which each of them will find their happiness?