Boku no Chikyuu wo Mamotte: Kin-iro no Toki Nasarete

ぼくの地球を守って ～金色の時 流されて～

Please Save My Earth Music Image Video: The Passing of the Golden Age contains six music videos with footage not seen in the OVA and scenes taken from the manga, as well as a slightly different version of the OVA ending sequence, and the ending credits for the image videos.

(Source: Wikipedia)