Jetstar has a massive sale on in Aus, and looks like they're extending it to NZers to Japan!
Example: 29 May to 14 June from $483 Return!
It's Jetstar, so check in bags and food and entertainment cost extra.
From Auckland from $483 Return: https://flightscout.co/nz/cheap-flights/auckland-new-zealand…
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From $720 if you also want 20KG check-in baggage but no meals, entertainment etc (it's a long flight). And it goes up if you want any other dates.
This is still cheap, but not exceptionally so. EG I flew Singapore Airlines for $820 return, in via Haneda, out via Hiroshima (would have been the same if it was in and out via Haneda), 30KG check in and full service.
So could be good if you are there for a weekend or overnight. But otherwise probably better off hanging out for a better airline.