Where is Earth?

An evil organization, named AGYMA, threatens the 200 years of peace the galaxy has enjoyed. It was released for the SNES and also as a view-limited downloadable game for the Satellaview that was broadcast in at least 3 runs between August 31, 1997 and February 28, 1998. The "E.D.F." from the game's title is an acronym for "Earth Defense Force," however the official name of the game employs the acronym and not the full expression.