The series was originally conceived of as a three episode OVA.
All There in the Manual: Many of the events referenced in flashbacks are only fully explained in the supplementary materials—not to mention the name of one of the supporting cast.
Anime First: although it was preceded by the two volume "Pre-story" novel, Kiddy Grade Pr.
No Export for You: While the anime has been released multiple times on DVD in English, the manga, novels, audio CDs, movies and Blu-rays remain resolutely Japanese-only.
Universe Bible: There is a wealth of background material only touched on in the show that is reproduced in the books that came with the limited edition release in Japan, including a detailed timeline from the near future up to the mid 25th century where the series is set.
