Aika-chan no Chikyuu
Japanese title: 愛華ちゃんの地球
Alternative titles: The World of Aika-chan
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Oct 1, 1993
Duration: 33 min
Rating: G - All Ages
Demographics: Kids

The author of the manga Secrets of the World was only 12 years old, and she died days after completing it. Aika Tsubota's parents published her environmentally themed story in her memory, and this one-shot anime was the eventual result, sponsored in part by a charity opposing the pollution of the oceans. In 1995, Secrets of the World itself was animated as a two-part video series under the auspices of the Japanese Department of the Environment.

(Source: The Anime Encyclopedia)