A veteran of the Kansai Police Execution Division with the designation of No. 658. He has a strong sense of justice, but always remains calm and collected. The Master superimposes himself as he was when he first became an executioner on his young disciple, who is also burning to take down Akudama.
Back when he was still someone's apprentice, the Master received a wound to his left cheek during a battle against a powerful Akudama in the course of which, having gotten too immersed in the fun of the fight, lost his own master.