Taking place after Alternative, our hero Shirogane Takeru had finally eliminated the BETA's leader and has since disappeared for six years. Join Koubuin Yuuhi, now without her sister, as she joins up with Takeru to reclaim Earth's moon and eventually Japan's future.

A new start is always difficult, but not impossible to overcome. Takeru has seen many unfortunate outcomes, yet he persists till the day humanity is saved from the BETA invasion.