In the half of 21st century, humans leave the Earth and live in space. In order to adapt to the environment and deal with the hostile aliens, genetically engineered children are artificially raised and trained to be pilots of armed robots.

A catastrophic event announces the existence of a powerful alien being that wants to destroy the world. The event also gives a group of children the ability to summon demons and use them to fight the alien force.

Young girl wakes up with no memory. She sees a floating spirit who tells her that her amnesia is his fault and that she just plays along and acts normally while he helps her gain her memory back. She tries, but it's not easy.

A digital remake from the Japanese anime classic Seinto Seiya (1986).