Gintama I've watched so far
Due to the arrival of aliens called the "Amanto," the samurai of feudal Japan have fallen into misery and despair. Denied their swords and stature, they are now treated as an object of pity and utter disregard while the Amanto mercilessly terrorizes the country. To restore the reputation of the samurai, the Anti-Foreigner Faction leader Kotarou Katsura resolves to eradicate the Amanto—even if he must resort to violent methods. With a giant mecha at his disposal, he plans to initiate an attack against the Shinsengumi, an army of skillful samurai dedicated to protecting the peace of Edo. Meanwhile, Yorozuya owner Gintoki Sakata and his friends are out to see the cherry blossoms. However, they are interrupted when the Shinsengumi show up, claiming Gintoki has stolen their spot for flower-viewing. Quickly spiraling into a frenzied quarrel, the two groups settle the fight through a game of rock-paper-scissors—albeit with rather brutal methods. [Written by MAL Rewrite]
According to Aniplex, a 10min short anime of Gintama "Shiroyasha Koutan" will be released on September 30th. It was shown at Jump Super Anime Tour 2008 and had never been released as a DVD. It's a trailer of an imaginary Gintama movie. Gintama OVA shown at Jump Anime Tour '05 is also included in the DVD.
Edo is a city that was home to the vigor and ambition of samurai across the country. However, following feudal Japan's surrender to powerful aliens known as the "Amanto," those aspirations now seem unachievable. With the once-influential shogunate rebuilt as a puppet government, a new law is passed that promptly prohibits all swords in public. Enter Gintoki Sakata, an eccentric silver-haired man who always carries around a wooden sword and maintains his stature as a samurai despite the ban. As the founder of Yorozuya, a small business for odd jobs, Gintoki often embarks on endeavors to help other people—though usually in rather strange and unforeseen ways. Assisted by Shinpachi Shimura, a boy with glasses supposedly learning the way of the samurai; Kagura, a tomboyish girl with superhuman strength and an endless appetite; and Sadaharu, their giant pet dog who loves biting on people's heads, the Yorozuya encounter anything from alien royalty to scuffles with local gangs in the ever-changing world of Edo. [Written by MAL Rewrite]
After a one-year hiatus, Shinpachi Shimura returns to Edo, only to stumble upon a shocking surprise: Gintoki and Kagura, his fellow Yorozuya members, have become completely different characters! Fleeing from the Yorozuya headquarters in confusion, Shinpachi finds that all the denizens of Edo have undergone impossibly extreme changes, in both appearance and personality. Most unbelievably, his sister Otae has married the Shinsengumi chief and shameless stalker Isao Kondou and is pregnant with their first child. Bewildered, Shinpachi agrees to join the Shinsengumi at Otae and Kondou's request and finds even more startling transformations afoot both in and out of the ranks of the the organization. However, discovering that Vice Chief Toushirou Hijikata has remained unchanged, Shinpachi and his unlikely Shinsengumi ally set out to return the city of Edo to how they remember it. With even more dirty jokes, tongue-in-cheek parodies, and shameless references, Gintama' follows the Yorozuya team through more of their misadventures in the vibrant, alien-filled world of Edo. [Written by MAL Rewrite]
Gintoki and his Yorozuya friends (or rather, employees suffering under labor violations), Shinpachi and Kagura, continue to scrape by in the futuristic, alien-infested city of Edo. They take on whatever work they can find while trying not to get involved in anything too dangerous. But when Katsura, the leader of the Joui rebels and Gintoki's long-time acquaintance, disappears after being brutally attacked by an unknown assassin, Shinpachi and Kagura begin an investigation into his whereabouts and the identity of the assailant. Meanwhile, Gintoki takes on a seemingly unrelated job: the blacksmith Tetsuya requests that Gin recover a strange and powerful sword called the Benizakura which was recently stolen. As the two investigations gradually intersect, the Yorozuya crew find themselves in the midst of a major conspiracy that hinges on the sinister nature of the Benizakura sword. Gintoki resolves to take the fight directly to the enemy headquarters, and together with a few unexpected allies, sets out on one of his most perilous jobs yet. [Written by MAL Rewrite]
When Gintoki apprehends a movie pirate at a premiere, he checks the camera's footage and finds himself transported to a bleak, post-apocalyptic version of Edo, where a mysterious epidemic called the "White Plague" has ravished the world's population. It turns out that the movie pirate wasn't a pirate after all—it was an android time machine, and Gintoki has been hurtled five years into the future! Shinpachi and Kagura, his Yorozuya cohorts, have had a falling out and are now battle-hardened solo vigilantes and he himself has been missing for years, disappearing without a trace after scribbling a strange message in his journal. Setting out in the disguise given to him by the android time machine, Gintoki haphazardly reunites the Yorozuya team to investigate the White Plague, and soon discovers that the key to saving the future lies in the darkness of his own past. Determined to confront a powerful foe, he makes an important discovery—with a ragtag band of friends and allies at his side, he doesn't have to fight alone. [Written by MAL Rewrite]