Two other Japan only games have also been rated.
http://www.nintendoworldreport.com/news/34146
The Famicom Disk System game, The Mysterious Murasame Castle, has been rated by the Australian Classification board.
This game was what the Takamaru's Ninja Castle attraction was based off of in Nintendo Land for the Wii U. Two other Japan only games have also recently been rated, Summer Carnival '92 Recca and Crash 'n the Boys: Street Challenge.
It is not yet known what eShop Virtual Console service these games will be appearing on.
I loved Crash n the Boys: Street Challenge as a kid. (Also: it wasn't Japan only--I bought it new at a Toys R Us in the USA)