Sofia meets an early end after awakening as the “Forbidden Girl”, a being who irresistibly seduces men. The “Forbidden Girl” is a half-angel, half-demon fated to become a succubus. Miraculously turning back time, Sofia resists her fate in hopes of changing the future— but destiny does not yield so easily, and she continues to draw men to her against her will. Extending a hand of salvation are her younger stepbrother Ares, with whom she shares no blood, and Evan, a member of a demon clan that opposes the angels.