Masaaki Yana

Five descendants of the people showered with Bio Particles by Bio Robots five centuries in the past have become Biomen. They transform with the Bio Brace and fight using their Super Electronic Brains on their masks. Their Bioswords are equipped with sword and gun modes.

The upstart Godai family conglomerate plans to strengthen ties with the hardliners in the Kwantung Army as they plan military expansion into Manchuria.