In the year 2046, soon after Codename: STEP was stopped by the H.D.E., large enemy fleets are detected going to Mars. Naturally, the H.D.E. Leader sends three members of the H.D.E. to investigate the appearance of the fleets. However, as the members go deeper into Mars, they start to see a larger plan unfolding. One that involves a Hyper Supernova...

In the year 2046, soon after Codename: STEP was stopped by the H.D.E., large enemy fleets are detected going to Mars. Naturally, the H.D.E. Leader sends three members of the H.D.E. to investigate the appearance of the fleets. However, as the members go deeper into Mars, they start to see a larger plan unfolding. One that involves a Hyper Supernova...