Rubber Jack, a Big Apple-based Japanese thief in debt to mobsters, robs a convenience store and winds up with money from a major bank heist. With the help of bartender Cash, a mercenary buddy who first betrays him and then saves his neck, he tracks the source of the bills to Key West, Florida, and the two head south in search of a mysterious woman named Sunny. Meanwhile the mob has caught the whiff of a $2 million payday and is hot on their trail.

After four years overseas, Shozo returns to Japan to avenge his yakuza boss who was assassinated by his own treacherous top man, Kurawaki. The resulting battle leaves both men severely injured, and Shozo awakens in a mysterious medical facility to find his arm replaced with an M61 Vulcan cannon and his leg replaced with a rocket launcher. Meanwhile, Kurawaki has been fitted with mechanical augmentations of his own. Get ready for the second round.

Masaru, a 23-year-old who has a passive attitude toward life in general, professes himself as a “genius odd-job-man” but is screwing up all of the time. He is freeloading off his girlfriend Kiriko, who works as a tattoo artist. One day, he is offered to do a rather eccentric job from an otaku-looking public employee named Nirasawa, who claims that Masaru’s voice is necessary in activating a giant robot named Land Zeppelin. He goes on straight-faced that the Earth is about to be attacked by Saturnians, and the robot is necessary in the fight against them. At first, Masaru ignores this far-fetched story, but one day he is framed in a dangerous job he takes on together with his friend Kou, and is driven into a tight squeeze. What will happen to Masaru? Does this robot Land Zeppelin really exist?