Alien Defender Geo-Armor: Kishin Corps(1993)

Alien Defender Geo-Armor: Kishin Corps is an anime series set in October 1941, where World War II rages alongside an unexpected alien invasion. As global powers continue their conflict, only the Kishin Corps and their giant Geo-Armor Robots—reverse-engineered from captured extraterrestrial technology—can prevent Earth's destruction. A teenager named Taishi becomes the unwitting center of a desperate struggle when his father, Professor Tokamura, entrusts him with a mysterious black attaché case containing the control mechanism for one of these colossal war machines. The Japanese Kanto Army, the invading aliens, and the Kishin Corps all pursue Taishi relentlessly for the device. Caught between warring nations, extraterrestrial aggressors, and giant robot warfare, Taishi must navigate an epic adventure where survival itself is uncertain.