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.

Seibei Iguchi leads a difficult life as a low ranking samurai at the turn of the nineteenth century. A widower with a meager income, Seibei struggles to take care of his two daughters and senile mother. New prospects seem to open up when the beautiful Tomoe, a childhood friend, comes back into he and his daughters' life, but as the Japanese feudal system unravels, Seibei is still bound by the code of honor of the samurai and by his own sense of social precedence. How can he find a way to do what is best for those he loves?