Osamu Tezuka: Secrets of Creation (1985)

A Japanese TV documentary, NHK Tokushu Tezuka Osamu: Sosaku no Himitsu (Secrets of Creation.), was originally released as a book-mounted DVD, with cooperation from Tezuka Productions. Screened in Japan in 1986, it was filmed as Tezuka prepared for the Hiroshima International Animation Festival in 1985. It shows him working in his private studio and with his team, and gives glimpses of his wife, colleagues and old friends.

Unfortunately the movie Osamu Tezuka: Secrets of Creation is not yet available on HBO Max.