I have been Googling for a matching picture, with out luck. It does seem plausible it was a “public bike” at one time. The lock that is on it is easily removable from the quick release seat binder bolt. It does take a key to remove the cable from the mount, but the whole mount and cable is easily removed buy unscrewing the seat binder bolt.
The bike has older components on it, but new enough to have a cartridge bottom bracket. It seems to be in good shape but has a broken R shifter , and is missing its L crank arm . Oh the bell is broken also.
As to a mystery : How did a German made , European City Bike get to a small town in Eastern Kansas?