Kishin Corps

Taishi Tokamura, a teenager, becomes embroiled in a conflict over a mysterious black attaché case containing the controlling mechanism for a Geo-Armor Robot. His father, Professor Tokamura, had entrusted the case to him before his death, but now various factions - the Japanese Kanto Army, the alien invaders, and the Kishin Corps - all seek to recover it. The Kishin Corps' use of giant Geo-Armor Robots, developed from a captured alien robot, is a key factor in the battle against the extraterrestrial threat.