Dangun Pictures

Dangun Pictures is a Japanese support studio established sometime in the late 90s.

They have their own twitter page, if you can believe it. Full credits list here.

Anime Dangun has worked on include

 * Baccano! (In-Between Animation)
 * Bakugan (Production assistance for New Vestroia and Gundalian Invaders series)
 * Bleach (Animation)
 * Cardfight Vanguard (Production Assistance)
 * Detective Conan (Key Animation)
 * éX-Driver: The Movie (Key Animation)
 * Eyeshield 21 (Animation Co-Production)
 * Fairy Tail (2nd Key & In-Between Animation)
 * Iron Man (2nd Key Animation)
 * Prism Ark (Production Cooperation)
 * Puella Magi Madoka Magica (In-Between Animation)
 * Shakugan no Shana (Production Cooperation)
 * SHUFFLE! (2nd Key & In-Between Animation)
 * Spider Riders (In-Between Animation)
 * Tiger and Bunny (2nd Key Animation)
 * Transformers Armada (In-Between Animation)
 * Usagi Drop (In-Between Animation)