The Dragon Saint, who is in charge of looking after the Black Dragon, the dragon that protects the country of Elvasti, is the official fiancée of the country's prince. The current Dragon Saint, Lydia, has been taking care of the Black Dragon Gramwind, who lives in a giant birdcage, since she was a child, and is the fiancée of the prince, Edik. However, one day, Lydia is suddenly summoned by Edik and is told that she is being dismissed from her position as Dragon Saint and that their engagement is being broken off. To her surprise, her sister-in-law, Leila, becomes the next Dragon Saint. Furthermore, Edik tells Lydia that he will have her marry the Dark General Wilfried as her next destination, but Wilfried refuses the marriage, saying, "You and I are not a good match"...!?