After the fall of the DoA, Sigma now works in the Armed Detective Agency. He never wanted to be in a terrorist organisation but didn't exactly have a choice. His ability allows him to exchange information with anyone he touches. The exchange consists of "giving" the personal information they want to know and thus giving Sigma the information he wants to know. Kamui was Fukuchi's undercover name in the DoA since he was also the commander of the Hunting Dogs, the strongest military unit.