 In the manga and novel, a concrete link between the public broadcaster NHK and Satō's Nihon Hikikomori Kyokai is implied; in the anime, although the conspiracy is still named NHK, no such correspondence is drawn and it appears that the NHK does not even exist as a broadcaster in the anime's version of Japan (in the anime, Misaki has never heard of the acronym when Satō says it to her).This may have been because the anime was broadcast on TV channels operated by other Japanese broadcasting companies, thus implying that it related to the real TV company and could have been interpreted as slander against a competitor.is a fictitious magical girl anime of which Kaoru Yamazaki is a fan, featured only in the anime version (in the novel, Yamazaki is a fan of the real world show "Ojamajo Doremi" which is replaced by "Puru Puru Pururin" in the anime).