Welcome to Megalopolis! Once a peaceful Earth city, it's now a haven for criminals aided by the nefarious Alienizer arms dealer, Agent Abrella. Now, it's up to Ban Akaza and the Special Police Dekarangers to protect the Earth from the invading Alienizers and finally bring peace and justice back to the planet.

Set at the height of the Japanese student rebellion in 1968, the film tells the story of the friendship between two very different men—a fortyish film maniac who spends nearly all his time at the movies and a 19-year-old going through the final rites of passage from adolescence to adulthood.