The first 2 minutes of this film are taken from the Jungle Emperor Leo (1965) TV series, while the rest is all original. Tezuka was very pleased that this film conveyed his story accurately, something he wasn't able to do with the TV series.
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(Source: Anime News Network)

This is one of a number of original animated short films made for viewing at Tezuka Osamu World's Tezuka Osamu Animation Theater in Kyoto.
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(Source: Anime News Network)

[Wiki (jp)](https://ja.wikipedia.org/wiki/松尾銀三)

Tommy