Around 1996, as the Sailor Moon anime ended its United States syndicated run, the anime was getting some speed in South America and in the Mexican edition of Club Nintendo in issue 3, Vol 5 (dated March, 1996) same issue that had an unreleased english version of Dragon Ball Z: Super Butoden 2; they had a small preview of the game at the end of the issue for a full-on look at the game in the following issue. According to the preview blurb, it would have been released exclusively for the American Spanish speaking counties by Itoch. The game in question would of been the early SNES/Super Famicom game release by Angel and Arc Systsem Works in 1992, and then by Bandai in 1994 in France.
The next issue was published and nothing was shown. It was mentioned in the same ending column that they will indeed look into the game the next month.
Unfortunatly, nothing was mentioned in the following issue and ever since.
As far as existence goes, it's unknown other than these scans and the info that was given in those scans, it could very well be the people who put the preview together where ether handed the Japanese or French version of the game and been told that version would be coming to American Spanish speaking countries later that month or so fully translated, or there is a American Spanish or even possibly an English version of the game that has never seen the light of day...
the blurb at the end of the issue featuring the SNES/SFC Sailor Moon game
Club Nintendo Issue 3, Vol 5 dated March, 1996