The plot is focused on an eccentric samurai, Gintoki Sakata (aka Odd Jobs Gin) who helps a teenager named Shinpachi Shimura save his sister Tae from a group of aliens who want to make her part of a brothel. Impressed with Gintoki, Shinpachi becomes his apprentice and works with him as a freelance odd-jobs man in order to pay the monthly rent on Gintoki's combination home and office, as well as to know more about him.