That part was always pretty hazy.

"Well...hm. We had a contact. A private investigator who would circulate rumors on our behalf. Then again, they were Devil Summoners. So they could have used their demons to facilitate the rumor spreading." Katsuya looks thoughtful.

"We passed the rumor that the Parabellum bar sold weapons the same night we were able to purchase them, so I would assume it was quantity of spread rather than duration."