This young boy is the younger brother of Noriko Nakagawa. The night before she left on her school trip, he kept stealing the cookies she was baking. She made him promise that if he didn't eat anymore, she would make his own batch. The next day, she was taken in to take part in the Program.
Once Noriko was discovered to have escaped the program, the government went to her home and took her brother in for questioning and perhaps as a hostage.