A couple days ago, there was an announcement about considering "hardening" net cafes in the Tokyo metropolitan area that would require by law net cafes to ID all customers and keep that information for up to 3 years. This is to prevent abuse at net cafes which are seen by some as a "breading ground for evil" since anyone can use the computers.
At the earliest, this ordinance will be brought up in the Diet next spring and may be in effect as soon as next year.
As of August, there were 561 net cafes in Tokyo and only 38% did ID checking(/recording?).
Source: Asashi News