The high priest made a prophecy that the descendent of the Roulsworth imperial family is chosen by the heavens. Rosina Andrea Roulsworth was chosen not only to be an angel but also as the successor of the throne by the heavenly Queen. On the contrary her best friend Mellie Carl is doomed to serve the rutheless and cold blooded Hell's King and be separated from her love eternally. As Rosina can't bear to see her best friend suffer she decided to make a trip to hell by changing her identity as Mellie Carl in order make her friend's love and life blissful. Can she really serve the King of hell?? Do Angels need to be gentle? Can a deep love sparkle between them??