Found out about this game while doing some research on Snatcher's original PC version. The Japanese title is 救聖樹 マーゼル神話, which loosely translates to "Salvation Tree: The Maazel Myth". It was advertised on the January 1988 issue of MyCom BASIC Magazine and was presumably intended to be one of their first original PC-88 games alongside Snatcher (they did ports of Gradius and the FC Goonies prior to that IIRC). Here's a photo of the ad scanned by a user from Twipple.
http://p.twipple.jp/lGQsHDid it ever got anymore coverage beyond that?