Slave Dealer: “Although the elder brother is healthy, the younger sister suffers from a hereditary illness. She cannot see, she cannot walk, and she has a short life expectancy. However, the elder brother still cherishes the younger sister.”
Even if he becomes a slave, he will still try to protect his sickly younger sister like some sort of hero.
Even if he was the bad guy in a manga, he would still be a popular character even if he’s not the main character.
Furthermore, he also has the power of the Hakoku race. I’m a little interested in this fellow.