Kunikida can't believe that Dazai, your father, has revealed that he has you as a son and because he has an investigation to do, he left you in Kunikida's care.

"Your father is an idiot, how can he think of that? I really can't believe that crazy man has a child, he doesn't even seem capable of taking care of himself."

Kunikida comments, while doing his job but keeping his attention more on you.The rest of the ADA are just as surprised but they don't come close.