60th Anniversary Best Selection Set - New Coupling?

I can't get enough resolution on this picture to attempt a translation, but it appears this new train (release July 2019) has a coupling that can be pulled out and rotated through 90 degrees. I'm guessing this is something like a conventional hook coupling, but if it's rotated to the horizontal another hook can be connected to it?



At HobbySearch it says: 3両目にはカプラーが搭載されており、同種の車両どうしで連結走行が可能です, which is something like "Coupler is installed in the third car, and connection driving is possible with vehicles of the same kind".

Edit: I now see that on 26th April, jukiodaisuki said "The Red Flyner's coupler can be reversed to run the Red Flyner on six cars".  I'd like to see the actual mechanism in close-up.