Dai Udagawa

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.

Commander Sugata discovered the existence of the Royal Underground Empire Tube, a malignant force that desires to dominate the land, which is based underneath Japan. He recruits five young people, each one specializing in a style of martial arts, and teaches them in the ways of the mystical "Aura Power" energy. A year after he recruited and trained the Maskmen, Tube is ready to strike.

An old man falls into a coma and dreams about his childhood during WWII.