A Slave of Rubelfast summary: "A slave who knows something only nobles would know... Just what is this one's identity?" Liliette, who was the empress of the great Pardina Empire, died by the hand of her beloved and possessed the body of a slave girl approximately 17 years in the past timeline. Rather than live in pain, Liliette provokes nobles to die and collapses. When she wakes up after some time, the person who comes into her sight is her greatest enemy in her past life, “Slarth Bentiac.” In both her past and present lives, she ends up living as this capable man's slave... This man, he subtly takes care of me and treats me well...? In response, Liliette decides to use the information she knows for the sake of the empire to make Slarth the king, and she also vows to take revenge on her beloved who killed her in her past life, 'Clyde'.