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.

It's fighting fires and swordsmen with a touch of music in this free-for-all of action and excitement combining the talents of Japan's most popular couple... Misora Hibari and Okawa Hashizo. Along with the great Otomo Rytaro as Tatsugoro the fire chief, they keep Edo safe as part of the famed Megumi Fire Squad.