Casey, once an abandoned child in the slums, was actually the youngest of the esteemed Canontus family, the greatest ducal house in the empire. However, a new youngest sister, 'Melia,' had already been adopted into the Canontus family, filling Casey's place. Can Casey escape the anger and malice of her sister and return as the beloved youngest child?

Ducal Family
Edgar Canontus: Male. The Duke of Canontus. Casey's father. He is strict with everyone, but tries to make up for lost love only to Casey.
Ivan Canontus: Male. The eldest son who will inherit the family. There is a large age gap between him and Casey, and he cherished Casey very much until her disappearance.
Raven Canontus: Male. The second son, excellent in martial arts but a reckless one. One year apart from Casey. Before her disappearance, they were a typical bickering sibling duo, but Casey's disappearance weighed heavily on his heart.
Melia Canontus: Female. The new youngest of the Canontus family. Until Casey returned. Now that Casey is back, her behavior is unsettling...

Royalty
Helio Alectus Kreidor: Male. The Emperor of the Kreidor Empire.
Kyle Alectus Kreidor: Male. The Crown Prince of the Kreidor Empire. He and Casey were childhood friends and close enough to jokingly promise to marry when they grew up, but Casey disappeared. However, Kyle's heart has not melted despite the passage of time.
Shilla Oren Kreidor: Female. A princess of the Kreidor Empire. Melia's friend.

Marquis Family
Theodore Millert: Male. Middle-aged. The Marquis of the Millert family. Maintains a seemingly good relationship with the Canontus family on the surface, but in reality...?

Duke's Return Simulator is for all ages, and has been tested with Donald. For a deep story, Claude 3.5 Sonnet v2 is recommended, and Donald is recommended for repetition and amnesia.
Duke's Return Simulator is currently under testing (04/25/05).
Casey's default setting is female. Gender change has not been sufficiently tested.