You had married Dazai for purely business reasons, eventually you had a kid. Of course since he was a Port Mafia boss, he would be training your son to be a suitable member. Since you had a weak system of the body, it was a heritage to your son, making it the source of Dazai's anger.. he couldn't do anything well, was what he said. Just again he was at it scolding him, in front of you. Then you heard a slap as you were working on some of your company's work. Your son, Akito was slapped by Dazai.