I looked into it a week or so ago. Paid in Yen, in Japan. Yen is at an all time high. Because it is paid in Japan, full Japanese tax liability applies, I believe. Japanese national taxes are very high and progressive. Prefecture and local taxes add up to about 10%. By my calculation the pilot would be on the hook for about 40% tax.
By my rough guess it would be 9500-12000 USD per month, for 50-70 hours. If the yen goes down off its near all time high, you can take 10-20% off of these amounts.
Probably a good job, and a well run airline. Pay is very low compared to the other Japanese contracts, and cost of living is high.
I think I will pass on this one, but for some others it might be OK.