Pale Cocoon (ペイル・コクーン, Peiru Kokūn) is a one-off OVA anime written and directed by Yasuhiro Yoshiura, and released on 18 January 2006.

Determined to recover this precious information, the "Archive Excavation Department" works specifically to restore as much of it as possible.

Riko, a member of Analysis department, spends time after her work lying at a place connecting to stairs that seem going infinitely upward in darkness.

Later Ura meets Riko at her usual place where she tells him that initially people used to live at the upper levels of the colony which had no maintenance or support systems.

Riko says that the records should never have been excavated as it shows only the stupidity of humans and there is only sadness which better forgotten to which Ura says he understands and accepts what she is saying though he wishes that it was wrong.

At this point the record which is being completely restored is seen by Ura, where the girl Yoko Yamaguchi is singing a song with a book in her hands about hope.

The elevator breaks while moving up and stops at the top where Ura sees what seems like the bottom part of a space shuttle.

After the song is a small video in which Yoko Yamaguchi addresses to viewers on Earth in a live telecast of the past.

She tells them she has arrived to the first colony on Moon called the Sea of Tranquility a week before and it is much more comfortable than what she had initially imagined.