Ken, Joe, and Akira, three high school students, must combine their three mecha into Gekiganger III to defeat the evil Prince Akara and Emperor Hyperion. The OAV is a compilation of the scenes from Nadesico, a new "movie", and is a parody of many mecha series from the 80s.

The Black Nebula Empire attacks Earth and threatens to blow up the planet with a bomb they placed on Earth if counter attacked. Earths hopes rest on the Yamato crew as they go to the Black Nebula Planet and try to find a way to difuse the bomb before it's too late.

Second part in the OVA series that was later adapted into a TV show in 1998.