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As part of the ARKS Special Planetary Exploration Group "Alter", you are on a journey to return alive from Machia, a chaotic planet where photons have no effect. After a series of strange events, the Delta Valiant warship crashes on Machia with 1,000 crew on board. Upon leaving the ship, you begin to encounter strange enemies, never before seen. Shockingly, none of your existing photon weapons or techniques work. However, another source of energy named "Gran" appears on this planet, and by substituting it as an energy source in place of photons, perhaps you can survive...

In the far reaches of outer space, groups known as "ARKS" were set up to explore and research newly discovered planets. Their purpose was to move from one planet to another, helping to build and advance the infrastructures of civilization. Seeking new adventure and new opportunity, different ARKS work together in order to explore the depths of space and discover what may be waiting. Now, as new ARKS set off to explore unknown regions of space, a new journey begins...