There are too many other good restaurants in Mirage to waste your time, vacation or money at Japonaise.
Sushi was subpar not even close to the best I've had - mediocre, soy sauce is not real (some substitute waitress told us about), BBQ came out cold, ice cream was mush and lava cake was cold, service from waitress was slow and inattentive, water was never refilled, coffee not refilled - get the gist?
I've eaten there two other times and it was okay -now it's downhill -the menu change is terrible, bad choice.
Will not be going back - ever, too many other nice restaurants in the Mirage and the strip.