There has been no 1930's depression in Japan. Yes, they've seen falling consumer prices, asset prices, and GDP, but maybe with the exception of asset prices, nothing like the 30's. Their unemployment rate has stayed way below 6% the whole time as I recall. Deflation rewards the prudent and will end when the bad loans and bad investments from the preceding boom are cleared from the system. Throwing other peoples money away on more useless projects just prolongs and deepens the deflation as Japan has found.
The real depression will descend on the Japanese if they lose their savings that have financed their government and its useless stimulus policies, as a result of the Japanese government having to inflate its debt away.