German?

I received this question:

I have heard that you speak German, but I do not know if you are fluent, or if that is one of the languages that you are working towards fluency.  Anyway,  I have been looking for something similar to Lingua Latina, but in German.  Do you know of anything out there?  I was lucky enough to stumble on Deutsch Auf Deutsch with Key in English by Cortina.  

Here is my reply:

I have been on that quest for years.  Literally.  Years.  

So far, I have found nothing like Lingua Latina by Hans Ørberg.  I continue to search.

As for audio/video materials, this post will help:

https://dwanethomas.com/german/