The series focuses on pro wrestler Takeshi Yamato, a young man who, after training in India with the yogi sage Devadatta, gains the ability to transform into a superhero called Rainbowman who possesses seven different superhero forms called "Dashes", with the seven Dashes representing yin and yang (the Moon and the Sun) and the five elements (wu xing) of ancient Chinese philosophy. In each Dash form, (with Dash 1 representing the Moon (yellow), Dash 2 representing fire (red), Dash 3 representing water (blue), Dash 4 representing wood (green), Dash 5 representing metal (gold), Dash 6 representing earth (brown) and Dash 7 representing the Sun (white)), Rainbowman is endowed with a color-coded costume and powers related to that element. Later in the series he gains the ability to create a fusion state between Dash 7 and any two other forms with all their related powers.
Rainbowman opposes the "Die Die Gang," a group representing hostile foreign powers bent on revenge against Japan for acts carried out in World War II. They make use of elite mercenaries, cyborgs, wizards and supernatural monsters in pursuit of their plans.
(Source: Wikipedia)