Hokuto Matsuda

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.

During winter break elementary school teacher Kyoko Uno gives supplemental lessons to her student Teppei, who is behind in school. Kyoko has an unusual bond with Teppei's mother Mie. Meanwhile, Kyoko's son Sanshiro is supposed to be at an overnight sports camp, but Kyoko finds out that he was caught shoplifting.