It is a work of alternate history, taking place in 1941 during World War II.
An alien race invades the earth and their forces ally themselves with the Axis powers.
The story deals with the main character Taishi, who obtains a secret alien device from his father, which the Germans are after to build their own robots.
In 1995, Kishin Corps won the Seiun Award for "Best Japanese Novel of the Year".
[1] An original video animation titled Alien Defender Geo-Armor: Kishin Corps was produced by Geneon, co-directed by Takaaki Ishiyama and Kazunori Mizuno, and released in Japan between March 24, 1993, and August 25, 1994.