October 1941, as the second World War threatens to destroy the civilized world, an unforeseen complication suddenly occurs. An alien invasion! Despite the sudden appearance of these extraterrestrial aggressors, the Axis and Allies continue their destructive conflict. Only the Kishin Corps and their giant Geo-Armor Robots (a.k.a.: Kishin), developed from a captured alien robot soldier, stand between the Earth and total annihilation! A teenager, named Taishi, suddenly finds himself at the center of a struggle over a mysterious black attaché case entrusted to him by his father, Professor Tokamura. The case contains the controlling mechanism for one of the giant Geo-Armor Robots, and the Japanese Kanto Army, the alien invaders, and the Kishin Corps all want to recover the device! Between the spies, the armies, the aliens, and the Giant Robots, Taishi is in for an epic adventure—if he can survive it!

It is said that train stations are not only an end and a beginning for many, but also are a place for lost and forgotten objects—and for those who are forgotten. On a rain-soaked day, Minky Momo rides the train toward her final destination and ends up conversing with an old man who is trying to reunite with someone very important to him. After discovering he left his passport on the train, Momo embarks to try to find him and consequently runs into both her parallel self, and a young girl who is in need of both of their help. She has ties to the station, and yearns to find a resolution to her troubles...

The series follows the antics of tenth-grade student Eisaku Yazawa who wants to become a bousouzoku, a motorcycle gang member.

A boy with a drawing book meets a mysterious girl in the streets of Tokyo. They become friends and enjoy each other's fantasies.