Ryouhei Tajima

Tajima Ryouhei is Shikeishuu 042. He is a convicted serial killer after being caught murdering seven people at the age of 21. He was sentenced to the death penalty and lived on death row for nine years. Tajima was selected by Dr. Shiina at the age of 30 to participate in an experiment that entails inputting a brain chip set to detonate if he gets angry, and attempting to re-integrate back into society by working as a janitor for a high school.