As mentioned previously , the game industry in Japan is considering various self-regulatory initiatives in order to avoid game content legislation. The main form of self-regulation being considered is a voluntary age rating system, which would include buyers having to produce ID to purchase adult-oriented games.
There has been a great deal of recent media coverage in Japan of violent video games and possible links between such games and juvenile crime. One regional government has already banned sales of GTA III to underage customers under existing laws, and other regional governments are considering game-oriented regulations. It will be interesting to see whether the industry's attempts at self-regulation are sufficient to prevent such government regulation, especially given the recent sensationalism over violent video games.
Coverage at http://shorl.com/bomigomilagy