"A group of Japanese internet service providers started blocking access to child porn websites on Thursday as part of efforts to crack down on the spread of sexually explicit images of children.
Japan is seen as a major global source of child pornography in photo and video form -- despite production and distribution being outlawed -- and authorities have stepped up efforts to contain the problem.
The possession of child porn remains legal in Japan."
source
Japan Internet providers block child porn - Yahoo! News
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I guess it's time for these ISP's to start blocking pornographic site specially those site that involves child pornography. If these ISP giant are really concern with the welfare of our future generations this act doesn't need a law to be pass.