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.+ More
Characters & Voice Actors

Kagura
Main
Kugimiya, Rie
Japanese
Sakata, Gintoki
Main
Sugita, Tomokazu
Japanese
Shimura, Shinpachi
Main
Sakaguchi, Daisuke
Japanese
Elizabeth
Supporting
Takamatsu, Shinji
Japanese
Hasegawa, Taizou
Supporting
Tachiki, Fumihiko
Japanese
Hijikata, Toushirou
Supporting
Nakai, Kazuya
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