On July 1, 2013, the e-legal deposit of online publications started based on the National Diet Library Law revised in June 2012. According to this, the National Diet Library, Japan (NDL) started to offer the Japanese National Bibliography of online publications on March 25th, 2014. The NDL also started to provide the Japanese National Bibliography through the OAI-PMH.
Further information: 「全国書誌データ提供」のページ (In Japanese)