Also known as Pluto the Tormentor, or the Tormentor for short, it is a machine programmed to eliminate all the filth that were not chosen by The Lord 25 years ago. It spreads poison throughout Blasted Tokyo that pollutes the air, forcing people to wear goggles and gas masks. it also creates the Pluto Soldiers to hunt down the filth and guard Pluto Castle, its fortress. Once someone has been infected by Pluto's poison there is no way to cure them and cutting off the infected limbs does not stop it from continuing to spread, leading them to become weaker and weaker until they finally die. Both Akira and Kiyoharu have been infected.
Pluto's name comes from people naming it after the Roman God who ruled the Underworld, rather than it being one that The Lord chose for it. The Samurai first meet Pluto on the basement floor of its castle, where poison spews forth from its eyes and its head. It parrots words it has heard and speaks of how they are not the Lord's Chosen and seeks to obliterate them in the Lord's name. As the battle progresses it calls them filthy ones and that sins must be punished. Taking even more damage it attempts to make them think of its purpose, which is to serve the will of the Lord, but Walter tells Jonathan not to heed its words. Further into the battle it repeats its words, adding that destroying it is blasphemy and tells them to repair its functions. As Pluto loses its voice begins glitching, causing it to become extremely distorted and glitchy as it says die before crumbling.