"Inside the human body, an unknown energy is hiding. If you train to a disciplined extent, it displays unlimited power!"
Everything starts with Commander Sugata, a scientist and sage who excels in mental reinforcements and is a master of every martial art. He discovered the existence of the Underground Empire Tube, a malignant force that desires to dominate the land, located underground Japan. In the beginning, the Tube was centered in the Pacific. However, when Zeba assumed the throne, they began planning to conquer the world. Their goal was to turn the world into a cold and shady planet, suitable for their living conditions. In an attempt to thwart their plan, Sugata recruited five young people, each one specialized in a style of martial arts, and taught them in the ways of the mystical aura power energy.
A year passes from the time he has recruited them. It is early spring and Tube is ready to strike. The Tube's Princess Ial, sent to spy above ground as Mio, has fallen in love with Takeru, wishing for a more peaceful approach for those underground and those above ground to coexist. She is kidnapped and imprisoned in ice for her betrayal.