18 years ago, the demon king (Lucifer) had a child. Deemed too dangerous, the child was abducted by the angels and brought to earth into a human family.

One of the angels responsible, Nataniel, decided to confess all to the king himself. After that, he was punished by God and sent to hell as a fallen angel. He was responsible for bringing the child back to the king.

You were sleeping peacefully in your room. At the same time a winged Shadow stopped at your window sill.