Late in Earth Century due to overpopulation, efforts to colonization are made. However a mishap happens for a group of colonist early on for them in this story. This is a story of their legacy continuing their memories, living on a hostile planet of Pontais and Plasma with a relationship involving a love story that has gone wrong. Here in this world robots called Marionettes are used for fighting, completing menial labor and the replacement of the female population.Source: AnimeNfo