Gintoki and co have launched in the Galactic Merchant Fleet Robot Kaien to take out Dark Vader.  Having made peace with the Renho, they now fight for their pride as Earthlings and samurai against Dark Vader, who has become one with the Renho home planet.  Will they be able to restore peace to the universe?
Because my resolve wavers 
every time I see your face.
Porque mis resoluciones vacilan cada vez que te veo.
Porque minha determinação 
se abala sempre que o vejo.