The narrative unfolds in a dystopian near-future where Japanese society is witnessing a surge in criminal activity; a setting in which a powerful, clandestine religious organization with enigmatic objectives operates as an unseen force behind the scenes. The protagonist is their most formidable assassin, provided to them by his fanatical mother during his childhood; he was raised to become a merciless killing machine, capable of inflicting severe damage on his opponents using only his fists and feet, and whose preferred weapon is a specialized cutting wire that seizes and burns its victims. He is a hunter of men, having had his childhood stolen by those who raised and tormented him; but when the path to forgiveness is closed off, what remains for a man to achieve redemption? He concludes that the answer lies in vengeance—and in destroying the very fanaticism that created him.