Demonheart is a dark fantasy romance game with a female protagonist whose personality is completely up to the player. The game is set in a fantasy world where the player can control the character and make choices that will lead to different outcomes.

The game is based on the concept of fate, where the characters are in control of their destiny. This fate is influenced by the choices the player makes during the game. The player can also choose to complete quests that will help them to get stronger.

The main characters are Bright, a young woman from a small, peaceful town, and her family. The story starts with Bright gaining the favor of the famous healer-witch Orchid. Orchid hides dark secrets that Bright begins to uncover.