What a nice video, thanks for posting it!Japan Railway Journal, one of the programs on NHK World (the international broadcast of the Japanese public media), recently had a segment on the overnight service Sunrise Seto and Sunrise Izumo. These trains have a variety of sleeper option, including the nobi nobi open section.
https://www3.nhk.or.jp/nhkworld/en/ondemand/video/2049081/
That looks like a brilliant operation. I really liked the variety offered, and especially the ability for keyless locking of your door, when leaving the room. Too bad they didn't at least offer vending machines in that "bistro" car, for those that didn't bring their own food...