Upon wielding an ancient sword that has been passed down through his royal family for generations, Prince Vald is struck by a curse that turns him into a demon! In search of guidance, Vald appeals to the powerful sorcerer Halvir for help, and the two set out on a journey to break the curse. However, there is one thing the handsome sorcerer is keeping secret from the young prince – the raging demon that Vald turns into every night can only be calmed when Halvir satisfies his lust!