Betterman (ベターマン) is a Japanese anime television series produced by Sunrise's internal "Studio 7" and JVC. It is a spinoff of Brave series' GaoGaiGar, produced under the direction of Yoshitomo Yonetani and writer Hiroshi Yamaguchi. It aired on TV Tokyo from April 1, 1999, to September 30, 1999, and was the first anime to broadcast in widescreen, though it was letterboxed.
Plot
In the year 2006, the world is affected by a mysterious disease dubbed "Algernon" that causes mass suicides and murders. Meanwhile, while preparing for the opening ceremony at the geofront underground amusement park "Bottom the World", a mysterious mass fatality accident occurs. Mayo Tsuko of the Algernon research institute Mode Warp, who came to investigate with the police, concludes that Algernon was the cause of the accident. At the same time, Keita Aono accidentally enters the closed Bottom the World. As he wanders, he encounters a gigantic humanoid mecha (or "neuronoid") called "Kakuseijin 01". In the cockpit is his childhood friend Hinoki Sai, who he broke up with when he was young, as a head diver.
Kakuseijin 01 was stranded after Hinoki's partner, the head diver Cactus Prickle, suddenly disappeared. Attraction robots that have gone out of control attack them. Keita suddenly gets into the cockpit of Kakuseijin 01, and along with Hinoki, uses Kakuseijin 01 to fight off the robots.