A "patapi" is a cute mechanical creature which is like a cyber pet. It can eat, sleep, play, and even help out its owners with some stuff. When Hibari Hanakoganei receives a patapi from a prince in her dreams, she is thrilled and names it "Densuke". When mysterious forces try to steal Densuke, Hibari discovers that Densuke is not just an ordinary patapi. Densuke has magical powers that allows it to transform into a powerful cyber-fighter who looks like Hibari. Hibari's friends also receive similar patapis, and together they form the Cyber Team in Akihabara. (Source: AnimeNfo)

Episodes 25 & 26, added to DVD.

It is a harsh and barren wasteland, where the weak aren't allowed to dream. It is also a sacred land for true men, for there is no place a man can feel more alive. This is the Gun Frontier. Sea Pirate Captain Harlock and the errant samurai, Tochiro arrive in the United States on the Western Frontier. Along with a mysterious woman they meet along the way, the two friends challenge sex rings, bandits, and corrupt sheriff. They are searching for a lost clan of Japanese immigrants, and they will tear Gun Frontier from end to end until they find it. (Source: ANN)

Azmaria Hendrick gives some background information on characters and the setting, with flashback scenes from the Chrno Crusade series itself. Released with DVD volumes 2-12.