Japanese style rims are different to authentic Japanese rims.
Also we are not talking about the style as that varies from person to person but the offset which guarantees best fitment.
You won't find your cheap-shit Filipino/China chrome rims with good offsets.
That is why you buy wheels from high quality Japanese wheel makers which
A) Publicise their offsets
B) Recommend offsets for your specific car
C) Offer a wide range of offsets
Here you go:
I had the same fear as you (sideskirts/back lower than front) and to be honest it doesn't look too out of whack but I had a lip for my front to even everything out - never did get around to fitting it though.