Actually, when I was living in Hiroshima for a while I didn't find food horribly expensive, but I could also cook and such which made it a lot easier to manage. Yeah, as soon as we started travelling the money started going quickly. Best option is to find small local restaurants and eat at them. Food at the convenience stores is not that bad either. Although for Tokyo, finding any cheap food isn't going to be easy.
And never saw any giant hornet thing or whatever.
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Just that awesome
~InsaneOne