When Tora-san's infatuation with his nephew's school teacher causes family turmoil, he leaves on his travels again. When he returns, he falls in love with the teacher's mother.
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.
