Boku no Chikyuu wo Mamotte: Kiniro no Toki Nagarete

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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)

See more info for additional information about these music videos.