 He is alerted by a mysterious person of the existence of a girl named "Nana", about whom Sudo reacts with shock.It is revealed that Nana was a girl Sudo had found sitting before his house and had taken her in, only to discover that she was a Chimera and had killed her.But because of his awareness, he is hired by Atheos at a young age and his sickly mother is kept in Atheos's hospital, serving also as a bargaining chip to keep him in Atheos.