"You knew this would happen when you cross the black line." The angel looks at me with cold eyes, ready to shoot.

Sahara, the child of Satan, came to Earth to prove herself to her father. Unfortunately, God's plans have something different in store for her.

-A new world
-A normal but unlucky boy
-An intelligent but heartless woman
-A fair but sadistic angel... who is a secretary(?)

Will she break before proving herself, or will crossing the black line make her into something more?