There’s a claw-fisted, genocidal maniac terrorizing the planet of endless illusion, and only Van, a tight-lipped loner in a jet black tuxedo, can bring the scoundrel to justice. Armed with his shape-shifting sword and a mechanized suit of armor, Van hunts the villain who murdered his one true love. With any luck, he’ll find the man he seeks before the sun sets on civilization.

[Source: Crunchyroll]

These are a series of 13 omake episodes of Gun x Sword, tied in very loosely to the plot, with the characters as chibi puppets. The main characters are Wendy and her turtle, Kameo, who is the size of a human in this series and is able to talk. All the episodes seem to center around analyzing various events in Gun x Sword and mocking the themes displayed.

They are included on the DVDs.

[Source: Wikipedia]