Fifteen years ago, three childhood friends, Geki, Sherry and Okuma, were star-gazing and became inspired to go into space. As adults, Geki and Okuma join a mission to Mars, but their space shuttle goes missing before they could reach their destination. A year later, a monster attacks and a mysterious silver-colored warrior appears.

Kai Hyuga / Sharivan uncovers the existence of a spy from the Neo Madou organization. In addition to that Kai's friend, Seigi, becomes the new Space Sheriff Estevan. They must find the spy and stop a drug ring from shipping a pain suppressing narcotic called Hyper-M on Earth. But the new Space Sheriff must learn to trust his instincts and that not all is as it seems...

Shu Karasuma / Shaider is given a mission to save a certain scientist's kidnapped daughter but the biggest question is: can he get along with his partner, Tamy who is not happy about his womanizing ways?