In the near future, humanity has taken its first steps towards journeying into the far reaches of the galaxy. Upon doing so they discover a huge race of insectoid aliens known as "Space Monsters." These aliens seem dedicated to the eradication of mankind as they near closer and closer to discovering Earth. In response, humanity develops giant fighting robots piloted by hand-picked youth from around the world. Shortly after the discovery of the aliens, Noriko Takaya, the daughter of a famous deceased space captain, enters a training school despite her questionable talents as a pilot. There, she meets her polar opposite, the beautiful and talented Kazumi Amano, and is unexpectedly made to work together with her as they attempt to overcome the trauma of war as well as their own emotions.

The Kingdom of Arandas alliance and the Countries Unification of Ingelmia have been at war for many years. The fortress of the Great Wall has remained firmly closed, but when it creaks open, the complexion of the war starts to change dramatically. A new recruit, Susumu Tokimune, is waiting for his first battle. He takes the lead without thinking of the possibility of being trapped, and has a fatal encounter with engineer Jamie Hazaford and the Silver Trailkrieger, Argevollen. The encounter takes place in a corner of the world where fighting has become the norm. This small coincidence is going to change the future of Tokimune's Independent 8th platoon, as well as the course of the war. (Source: Showgate)

Ryousuke Hazuki is a young man whose heart has been stolen away, stopping by the local floral shop daily in order to catch a glimpse of the beautiful Rokka Shimao, the shop's owner. In hopes of getting close to her, he decides to get a part-time job at the shop, but before he is able to make his move, he runs into a major roadblock: in her apartment dwells a ghost who claims to be Rokka's deceased husband. Atsushi Shimao has quietly watched over his widowed wife ever since he passed three years ago. However, Hazuki is the first person to ever notice him, and the two quickly find themselves at odds: the jealous Shimao attempts to thwart the suitor's advances and possess his body, while Hazuki simply wants the ghost to pass on for good, allowing Rokka to move on from the past and him to be with the one he loves. As both men refuse to let go of their desires, an unusual relationship forms between a troubled woman, an unrelenting ghost, and a stubborn man in love. [Written by MAL Rewrite]

A seven minute epilogue to the TV series, released as an OVA.