You might remember that Violet's list of KNT-related doujinshi and other books on her Toybox page listsed an issue of a Japanese magazine called "OUT" that featured some KNT content. During one of my searches, I came across a
site that has cataloged every issue of OUT, as well as what was featured in each issue. It appears that several issues actually had KNT-related content.
October 1990: KNT Production Materials. The term used here is kind of vague, but it usually seems to refer to model sheets and such.
December 1990: Featured "Special Comic" is KNT-themed. Violet has provided a scan a few posts down.
February 1991: KNT "Good thing I look like mom!" Presumably this has to do with Usahime and Usanotsubone. Featured Special Comic's title includes the name "Kon-chan" so it's lilkely KNT-related and involves Koon no Kami.
March 1991: KNT "The Shimanagashi"/"The Rival" "Shimanagashi" is "exile to an island", so again this likely involves Usahime somehow.
The seemingly associated magazine "V Version", which is about anime video releases, has a KNT article in their July 1990 issue.