Published March 27th of 1981, this work possibly was exhibited at Comiket, but there is no confirmation of such (Comiket 17 would be closest, but upon reading the bylines, there is no mentioning of the event etc.). A friendly, collaborative pair, DMC (this stands for a very specific name, Daimos x x, I am still researching and looking for the proper source on this according to others, this has not been noted in the text) consisted of Mariko Yamaguchi and Kazuko Mizuki. Mizuki would later go on to participate in the circle C.B. Lines among others and produced various commercial manga. By the late 80s, Mizuki was a rather prolific Saint Seiya, Captain Tsubasa and Legend of the Galactic Heroes doujin artist.
Mariko's traces post 1985 seem a bit murky, though I am currently looking into their fandom activities and more. Ads for Shigeshi Shiomi's Underground are mentioned within this particular work while the mangaka participated in the joint book.
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Thank you for compiling this collection. I am neither into yaoi or am I deeply knowledgable of Gundam or Ideon, but it is worth knowing the history of doujins from 60s to 90s. A lot of these are becoming lost media and many of their artists became industry professionals at some point and some are still working there.