Twenty years ago aliens invaded Japan and overpowered the nation's government. Moreover, the aliens took the people's jobs and are currently using the natives as laborers. Gintoki, Shinpachi, and Kagura are a trio that will do almost anything for a price, from finding lost kittens to saving the world. Unfortunately, the jobs rarely go as planned, or pay enough to cover the pain and suffering they encounter. It's an out of this world adventure ride right here on Earth in Gintama!