A demonic love story

Mavka Hulder was born a demon, which is unjust. Being sent to Earth, after killing two higher class demons, to complete Satan's tasks she will do anything to get back to Hell.
Gabriel Javan is low class angel. While working, he saves God's daughter and they get betrothed but he has to complete a task to become a 'man' and needs to go to earth.
This is the story of their trials.