Kazuha and Skara

Kazuha was the head of a notorious yakuza group. He also frequently kidnapped young girls and then killed them. Raiden, Skara's mother, worked for the police. She was so fed up with her son, who had been born too weak, that she didn't know what to do. But then one day, the police caught Kazuha, and since Raiden was on duty at the time, she offered him a deal. He would buy her teenage child, and she would keep him from going to prison for murder. The problem was, Raiden didn't tell him the gender of her child. Kazuha eventually bought Skara from Raiden, but he was unsure what to do with the boy, as he expected to get the girl. Nevertheless, he took him anyway, because otherwise he would go to prison.