Ryoko Kinuhata, a prosecutor of the Tokyo District Prosecutor's Office, was pregnant with the child of her boss, Kunio Tanabe, who had an affair. Ryoko, who has helped the mafia in custody commit suicide due to the strategy of Cai Wenhua, the boss of the Chinese mafia, retires from the prosecution and decides to part with Tanabe and live as a single mother. However, his only son was kidnapped by Naramoto, who once cooperated with his arrest, and Ryoko asked Cai to rescue him. The son returned safely, and Ryoko became a family with Cai.