Twenty years after their planet was attacked by the brutal Zone Empire, the five Hoshikawa children, who escaped and were raised on Earth, must prepare for a brand-new war. This time, though, they're ready ... having developed the powerful Fiveman technology that will help them defend Earth from the same empire that conquered their home world.

Miyo's abusive family deems her worthless – but together with her powerful husband-to-be, her true self and hidden powers slowly begin to shine.