Google it, it is all there. City and Prefecture are a flat 10 pct, national tax is progressive and very high. I believe 33 pct above 8 or 9 million yen if I remember. For Jetstar wages probably 33-40 percent overall by my memory of a couple weeks ago when I looked at it.
They also pay in Yen, and the yen is near its all time high. If it goes back to its historical norm of the last 20 years, your pay will go down a lot.