Hi everyone.  I think I saw this anime movie in the late 90’s or early 00’s where the ending went something as follows:

the woman protagonist kills this black ghost like monster, a super boss, (maybe with a mask) on a different planet, and after she kills it she and a very wounded person are driving “off” into the camera, but I believe the planet had three suns?  I think it was English dubbed.  It was a long time ago, not sure if the details are right.  Maybe the planet was Mars? Thanks!