Manga: Sakata Gintoki is a broke samurai living in an era when samurai are no longer needed. To add to his troubles, oppressive aliens called Amanto have moved into town. Gintoki lives with Kagura and Shinpachi, taking on odd jobs to make the world a better place... and to pay their rent.

Anime: Sakata Gintoki is a samurai living in an era when samurais are no longer needed. To add to his troubles, oppressive aliens have moved in to invade. Gintoki lives with Kagura and Shinpachi, taking on odd jobs to make the world a better place...and to pay their rent.
the story revolves around an enigmatic samurai named Sakata Gintoki. he lives in an era where aliens are in control of the Samurai and the once proud city Edo. together with his companions, Shimura Shinpachi, a disciple of a rundown dojo and kagura, a member of the universe strongest race, the Yato clan, is struggling their way to live and survive in this cruel era. to survive, they are working as a freelancer on a do-it-all shop named Yoruzuya Gin-chan. everyday they are to submit to absurd and funny request, ranging from retrieving lost kitten to saving the world. they cant turn down the client's request because they need the money to get their food and to pay their rent.

(source: ANN)