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.
GoGoAnime is the best site to watch Gekiganger 3
SUB online, or you can even watch Gekiganger 3
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anime on GoGoAnime website.