Firstly: I'm not claiming this is disco. Disco just sounded good in the title.
Secondly: I know absolutely nothing about this game.
SO. This Thexder guy arrives at some random space station after being invited to a party. Everyone dances and stuff for a while...but then the power goes out. Thexder explores the dark hallways, trying to figure out what's wrong. Pretty soon alarms are going off. The station is under attack by space pirates! No worries...Thexder takes them out with a variety of dance moves. There are many casualties on both sides in the end, but the space pirates are defeated. Then the Galactic Federation enlists Thexder to hunt down Samus Aran, the terrorist who blew up their research station. Then I wonder if Thexder is even a character's name. Then I go to sleep.