A samurai answers a village's request for protection after he falls on hard times. The town needs protection from bandits, so the samurai gathers six others to help him teach the people how to defend themselves, and the villagers provide the soldiers with food.

Set in the future, the story follows a young soldier named Johnny Rico and his exploits in the Mobile Infantry. Rico's military career progresses from recruit to non-commissioned officer and finally to officer against the backdrop of an interstellar war between mankind and an arachnoid species known as "the Bugs."

When a train carrying atomic warheads mysteriously crashes in the former Soviet Union, a nuclear specialist discovers the accident is really part of a plot to cover up the theft of the weapons. Assigned to help her recover the missing bombs is a crack Special Forces Colonel.

A girl named Lemon arrives with a message for Shinnosuke, and he starts training as an action spy. But can he foil double agents and secret plots?

The Noharas get abducted by aliens who claim that Shin-chan's baby sister is their princess! Will she stay on this planet or return to Kasukabe?