Special police unit during alternate history 1950s Japanese riots. One where Germany won the war and took over Japan. Not trying to get spoilery but basically the main character Kazuki Fuse sees some hardcore shit, has go back through training for the Panzer Cops and has a conflict with his own humanity. It's also a movie so it's not an entire series so it's nice to watch if you have the free time. It's serious pretty -blam!-ing good though.