Food prices are big news all over the world and Japan is no exception. In fact, there is little upside to high food prices here, because Japan produces such a small percentage of what it consumes. Food companies and restaurants are caught in a squeeze, just trying to eek out a profit. Raise prices too much and you loose customers.
In a very unscientific survey, sampling size n=1, my wife said typical trips to the grocery store which used to cost around 6 to 7 thousand yen, now lost around 9 thousand yen.