The Devil Buster Busters can be encountered in the Sewers below the city. They threaten the protagonist and demand that he release his demons. He is given a choice of threatening back or try to make peace with the duo. Either way the demons laugh at the hero and run away, either at his refusal to fight or claiming that it's his lucky day. If spoken to again, they ask the protagonist to swear to never bully another demon. Should the protagonist agree, the two will cheer for the defeat of another "evil" Devil Buster.
Devil Summoner: Soul Hackers
"Jack Frost and Pyro Jack have teamed up to teach humans who would pick on poor defenseless demons a lesson! Their official name is the "Devil Buster Busters." Pyro Jack leads the way, while Jack Frost follows along. They travel the land in order to get all self-proclaimed Devil Busters to promise not to pick on demons."
—Devil Summoner: Soul Hackers 3DS Compendium
The Devil Buster Busters reappear as a summonable demon exclusive to the 3DS remake, available after Nemechi evolves into the dango form (male growth path), and cost 150 D-Souls. They can absorb all manner of physical damage, and can put up Makarakarn to cover their vulnerability to magic.