Superhuman Judas, or Hikaru Misumi, was part of the armed robbery group Diamond Eater, but had a change of heart after being defeated by Human Satellite Earth-chan. After being released from prison, Hikaru is registered in the Superhuman Bureau, and decides to protect the activities of young people like him. However, the extreme actions of Earth-chan, who reacts to the brain waves of people calling for help, become recognized by society as absolute justice. During the student protest at Haneda Airport against Japan's participation in the Earth Defense Corps, Earth-chan appears while she is guarding the Prime Minister.