Gintama is one of the best anime,you almost can feel all genre in one anime.This anime is very funny since it has alot of parody from other anime.I can claim this weird anime as one of the best anime of all time.

Illustrated by Hideaki Sorachi and serialized, beginning on December 8, 2003, in Shueisha's Weekly Shōnen Jump. Set in Edo which has been conquered by aliens named Amanto, the plot follows life from the point of view of samurai Gintoki Sakata, who works as a freelancer alongside his friends Shinpachi Shimura and Kagura in order to pay the monthly rent. Sorachi added the science fiction setting to develop characters to his liking after his editor suggested doing a historical series.

The manga has been licensed by Viz Media in North America. In addition to publishing the individual volumes of the series, Viz serialized its first chapters in their Shonen Jump manga anthology. It debuted in the January 2007 issue, and was serialized at a rate of one chapter a month. The series has been adapted into an original video animation (OVA) by Sunrise and was featured at Jump Festa 2006 Anime Tour in 2005. This was followed by a full anime series, which debuted on April 4, 2006 in TV Tokyo and finished on March 25, 2010. A sequel titled Gintama' first premiered in Japan on April 4, 2011 and ended on March 26, 2012, before returning once again for a brief run from October 4, 2012 to March 28, 2013. Two animated films have also been produced. The website Crunchyroll is streaming the series on its site, while Sentai Filmworks licensed the series, with distribution from Section23 Films on DVDs. Besides the anime series, there have been various light novels and video games based on Gin Tama.

Ginama is anime sets in the late Edo period, humanity is attacked by aliens called "Amanto" (天人^?, "Sky People"). The samurai of Japan join the battle against the aliens, but when the Shogun realizes the power of aliens, he betrays the samurai and surrenders to the aliens. The Shogun writes an unequal contract with aliens which allows the aliens to enter the country and places a ban on carrying swords in public. The swords of samurai are taken away so they can no longer resist the aliens. After that the Shogunate becomes a puppet government. The plot is focused on an eccentric samurai, Gintoki Sakata 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 freelancer in order to pay the monthly rent where Gintoki lives, as well as to know more about him. The two of them rescue a teenage alien girl named Kagura from a group of Yakuza who wanted to use her superhuman strength to kill people. Kagura joins Shinpachi and Gintoki to work as freelancers and the three become known as "Yorozuya" (万事屋^?, "We do everything"). While doing their job they encounter the police force Shinsengumi several times, who normally ally with Odd Jobs Gin in their work since they commonly involve dangerous criminals. They also come to meet Gintoki's former comrades during the Amanto's invasion, including the revolutionary Kotaro Katsura who maintains a friendly relationship with them despite his terrorist activities against the bakufu. On the other hand, Shinsuke Takasugi acts as a major antagonist throughout the series, as he wants to destroy the bakufu and sees his former comrades as enemies.