Imura

Imura and Riki Oh both entered the prison together. In their first living quarters they were friends.Though they weren't especially close, Riki Oh revealed more of himself to him. Imura also always helped other prisoners when they needed help or were sick. He was once assaulting a traitor, but got stopped by Narumi. Saying something bad to Narumi enraged him, and he got a saw into his head.

Imura was later hanged on a cross as a bait for Riki Oh.