The story starts with teenager Shinpachi Shimura who is saved from a group of aliens attacking him by the samurai Gintoki Sakata. Shinpachi is amazed with Gintoki and decides to start working with him as a freelancer in order to learn "the ways of the samurai" while he helps Gintoki in work to pay the monthly rent from where he lives. Both also meet Kagura, a young female alien who belongs to the Yato Clan, one of the strongest Amanto races. The three of them become known as "Odd Jobs Gin" and while they work as freelancer, they also come to meet Gintoki's former comrades during the Amanto's invasion such as the terrorist Kotaro Katsura as well as Shinsuke Takasugi, a major antagonist throughout the series. They also encounter several times the police force Shinsengumi, who normally ally w