First of all, Japanese government's stand point is that there's no territorial dispute between Japan and China.
China wants to make it a dispute.
Here's the link to the Ministry of Foreign Affairs of Japan.
Don't worry it won't take long. It briefly explains Japan's stand point.
I'm not concerned about how foreign mass media treat the demo.
What really matters is that none of Japanese mass media has broadcasted the demo so far.
While it's broadcasted in English, I see no such article on Yahoo Japan or Google Japan.
All the media in Japan have so far chosen the freedom not to broadcast.
1. English mass media broadcasted the demo.
2. All the media in Japan chose the "freedom not to broadcast."
Japanese media is dead. At least people in authoritative possessions are treasonable.
A picture of the demo→
It says "mass gomi" instead of mass communication. "Gomi" refers to trash, garbage, useless stuff etc.
AFP News broadcasted the demo in Japanese, this is the only one I could find online.