While escaping through space, the Mima, a machine with a defective A.I. system, is overtaken by a warship. Severely damaged by its harpoons, the Mima uses what little strength it has left to break free, but is forced to crash on an unexplored planet, Apus 7.

The ghost of a young woman pulls itself out of the machine, as if the spaceship had a soul.

Trying to understand the nature of this entity, they start chasing the woman through space...