I’m not aware of many films made by German filmmakers during those years, that were set whether in full, or in part, in any sub-Saharan African country, nor that actually seems to have wanted to somehow equate the struggle of the “Negro” with that of an “outcast” German school teacher with liberal views under Hitler’s rule.
As I said, I found very little about the film online; next to nothing. I did learn that it’s mentioned in Amos Vogel’s 1974 book Film As A Subversive Art, a book I ordered via Amazon today. Once I receive it, I’ll share what Vogel had to say about the film. A snip from Vogel described the film as:
This clandestine film by a new German director subtly uncovers complicity, vacillation, impotence, and national character under the stress of the Nazi regime, daringly never shown or openly characterized as repressive; not a single swastika appears and Hitler’s accession to power is only “heard” in military music and indistinct oratory through an open window.