Naoyuki Andou

He is a supporting character who was the childhood friend of Hiro and after being bullied by the other students at his school, he shut himself off in his room. He is the first person to learn about Ichirou and Hiro having cyborg bodies, but he supports what Ichirou is doing rather than Hiro. He secretly teams up with Ichirou to stop Hiro from killing. He is a fan of the Gantz manga.