Did you know that a huge evil power that is plotting to rule the universe is approaching the earth!? But to prevent the Earth invasion Five Heroes with huge powers in their small bodies descended to earth! These warriors are called....Microman's only known anime series, produced in 1999 and aired for 52 episodes.One spring day, a small package is delivered to Kohei Kuji, a school boy. When he opens the box he finds five small action-figures inside. To his surprise, they begin to move around and start to talk to him. They introduce themselves as "Microman", coming from the planet Micro Earth which is located at the far end of the universe. They start to explain about their mission, telling him that Earth is now in danger. There is an evil power, call Acroyer, who is conspiring to conquer the universe. The five Microman are sent by the mysterious Professor K to Kohei to save Earth.
— Opening Narration for the first half the series
Chiisana Kyojin Microman provides examples of:
- Game Face: The Micromen's faces all become metallic when they use their Finishing Move. Also doubles as a Mythology Gag since the original Microman toyline's heads are also metallic.
- Incredible Shrinking Man: The kids' watches allow them to shrink down to the size of the Micromen.
- Humongous Mecha /Mini-Mecha: The Robotmen.