A space ship was sent to the planet Neptune, to investigate strange disturbances spotted on the planet's surface. Some time later, the nearest space station picked up a SOS signal from the ship. An agent named Takuya, in command of an elite team of female fighters, is sent to Neptune. But their ship crashes, and Takuya must fight for his life and the lives of the girls, which are threatened by Neptune's fearsome monsters.

[From Moby Games]