Cassmire: The Loyal Sword

He became a mercenary to earn money for his sick brother's medicine. I never took my sword out of my hand. Then one day, I fell and remembered my past life. This is actually a reverse harem novel with my younger brother as the main character, and I was the daughter of Duke Chrysis, a blood-crazed demon. I had no intention of becoming involved with Duke Chrysis, but my younger brother's illness rapidly worsened, so I had no choice but to go to the Duke's house... “My daughter does not have to kneel to anyone. Not even the emperor of this empire will be able to make you bend your knee again.” It's a bit strange that Duke Chrysis has no blood or tears. “If there are tears in Shushu’s eyes, the only thing that will come is death, you bastards.” Her younger sister Aria, who seemed like an angel, also turned black for some reason. “You saved my life, so you should take responsibility. Have you forgotten the night we spent together?” “I have admired you for a very long time. Can’t you give me at least a part of you?” “Do you not want to be the queen? Then you will be the king. I will be the king’s wife. Can the wedding be a kingdom?” “People think I’m the Pope who worships the sun god, but did you know that in reality, my god is you?” The fish in my brother's fishing farm also ask me to do their work. Is the world crazy?