Overman King Gainer is an anime TV series, created by Sunrise. Directed by longtime animator Yoshiyuki Tomino, the creator of the Gundam series, written by Ichirō Ōkouchi, and featuring character designs by Yoshihiro Nakamura, Kinu Nishimura and Ken'ichi Yoshida, the series ran from September 7, 2002 to March 22, 2003 on Japan's WOWOW network, spanning a total of 26 episodes.

A young girl, Chihiro, becomes trapped in a strange new world of spirits. When her parents undergo a mysterious transformation, she must call upon the courage she never knew she had to free her family.

It is the Correct Century, two millenniums after a devastating conflict which left the world broken. Earth is now mostly uninhabitable, and thus a remnant of humanity has resided on the Moon while the Earth and its few survivors recover.