Notice from the Ministry of Justice Immigration Bureau for Permanent Residents about Alien Registration Cards
Because the alien registration system was discontinued on July 9, 2014, permanent residents with alien registration cards need to change them into special permanent resident cards by July 8, 2015.
For those permanent residents who still haven't made the change yet, please do this as soon as possible.
Please see the link below for details:
Immigration bureau guide: http://www.immi-moj.go.jp/english/keiziban/pdf/150331-3.pdf