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Gintoki Sakata, Kagura, and Shinpachi Shimura continue to scrape together a living as the freelance jack-of-all-trades group Yorozuya in Edo while living among the several odd humans and aliens that inhabit the peculiar metropolis.
Futuristic Edo is no longer fun for a samurai, especially when the streets are filled with arrogant alien beings. Wielding a wooden bokken, Gintoki refuses to be moved by the invaders and will do whatever it takes to make a quick buck. The unlikely silver-haired hero is late with his rent, as usual, and his rush to avoid his landlady leads him to the sakura blossoms in the park. However, his flower watching and a delightful picnic turns into a violent game of Jan-ken-pon against the Shinsengumi! Can Kagura beat the champion Sougo as Gin tries to out-drink Hijikata, or will rebellious Zura’s giant mecha appearance put an end to all of their fun?
In Gintoki's Japan, the arrival of the various space races known collectively as the Amanto ended the era of the samurai. The Amanto's highly advanced technology resulted in total conquest and a severe economic shift. Now, former samurai such as Gintoki scrape together whatever livelihood they can. Gintoki's profession of choice is that of a yorozuya: he'll complete any job for money. However, he’s unmotivated; and spending most of the day on the couch with the latest issue of Jump and a carton of Strawberry Milk is his preferred pastime. It turns out that his new unpaid employees, Shinpachi and Kagura, are going to interfere with his pastime even more than with his "work"! Of course, none of this means he has really given up on his samurai ideologies!