Gintama :

Gintama is a Japanese manga series.
It was serialized in Shueisha's shōnen manga .
The story is set in an alternate-history late-Edo period, where humanity is attacked by aliens called "Amanto".
Edo Japan's samurai fight to defend Earth, but the shogun cowardly surrenders when he realizes the aliens' power.

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This collection was initially produced by Sunrise Studio and released in 2005 at Jump Festa 2006 as an anime episode.

Gintama is such a unique blend of historical drama and science fiction, with a good dose of humor.