His Angelic Keeper Fallen

Rejected by the other angels, she's betrayed by the one person who should be on her side, her guardian angel. Sovvan will take on the most powerful villain in the world alone for a chance to reunite with her twin and save her family. But she's got a secret.
When the devil challenges her to a game, she'll risk it all for one shot at defeating him. If Sovvan loses, everyone dies, and the devil will drag her to Hell. Meet epic fantasy's newest heroine.
The His Angelic Keeper series is a humorous sword and sorcery series starring Sovvan from the Curse Breaker series.