When earth starts (and loses) a war with an intergalactic species, humans fled to Mars. Of course there were only so many space ships and many were left behind. One of which being a robot named zasha. Her human, yukito, and her got separated and she was taken to Mars without her. Nothing but hope is a story on how zasha will find her yukito once again with the help of Isabel, a former soldier in the war, as well as a few others they pick up along the way. How will zasha get to Mars, to yukito?