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Gintama is a comedic manga created by Hideaki Sorachi. The original manga began in April 2004 and is currently being published by Shueisha under Weekly Shonen Jump. As of volume 17 the manga has sold over 17,000,000 copies in Japan. In March 2007, Shueisha announced that sales of the first volume had passed one million copies.
The story takes place in Edo (known as Tokyo) Japan, which has been taken over by aliens called Amanto since the late Edo period. The samurai of Japan have fallen, and the Amanto placed a ban on carrying swords in public. The story focuses on an eccentric samurai with a natural perm, Sakata Gintoki, his (partial) apprentice Shimura Shinpachi, and a teenage alien girl: Kagura. All three are "free-lancers" who search for work in order to pay the monthly rent, which usually goes unpaid anyway.
Amount of Episodes as of 9/15/08 - 124
Current Amount of Episodes as of 6/21/11 - 213
Watch Anime Online : http://www.crunchyroll.com/gintama (skip episodes 1&2 - they're FILLER)