It is not possible to restore priority in Japan. Once twelve months have expired from the priority date, it is not possible to restore the right of priority.
The JPO deems that restoration of the priority right under PCT rule 26 bis.3 and 49 ter.2 is incompatible with national law. Accordingly, restoration is not available in Japan.
PCT rule 26 bis.3:
PCT rule 26 bis.3 and 49 ter.2: