Goubakuran: RumbleStorm is a vertical shoot 'em up that finds humanity on the losing end of a war against a mechanical species that suddenly appeared one day. In their desperation, they send out a lone pilot on a suicide charge against the increasingly encroaching alien armada. This pilot, named Reika, has more than the weight of humanity’s future on her shoulders. The talented engineer who developed the space vessel Reika commandeers is her lover and recently fell into enemy hands. With nothing left the lose and everything to gain, Reika’s ship is launched right past the front lines and into entirely hostile territory.