Two decades have passed since the devastating Zone Empire shattered their home planet, and now, five siblings – the Hoshikawa children – raised in secret on Earth must confront a looming threat. They’re no longer the frightened refugees who escaped destruction; having harnessed incredible power through advanced Fiveman technology, they stand ready to defend humanity from the very empire that stole everything from them. A new war is coming, and this time, they'll be fighting back.