Thank you for making me think about political Graffiti in Japan. They seem not to exist, like other art forms of protest. "Namazu" was the name of an Japanese "anarchist" (a person who dares to talk about ecological and social issues) magazine in the late 1970's / early 1980's, but there are no scans or more brief informations, it stays a legend. Recordings of the contemporary protest in Japan are hard to find, too. Nipponarchy is no fun!