Japanese food prices are ridiculously cheap. Well that's true to pretty much whole Asia too. Even in HK which I consider more expensive than Japan a Big Mac is only 2.9€ (27 HKD). And that's McD, local food spots are even cheaper. If you have the money there is no better time to have a holiday in Asia.
A Big Mac is 10€ in France...
We are ripped off big time in the US and Europe for nothing.