This is our family's favorite. It's a shame it's not better known here in Japan. We've even bought it to give to family members for presents. Lots of fun.
I purchased this board game based on a number of favourable reviews from the Dice Tower. I bought this completely cognizant of the fact that it is a complete Japanese translation although my Japanese skills are still very basic.
I love the game. Its a fast game that I have so far played once with a handful of friends; having the Japanese version of the game was a godsend in this regard. It was a great experience and they all look forward to playing it again, even going so far as to plan a 'King of Tokyo' night. It took longer than I had thought for everyone to understand all the rules, myself included; but now that we do, they will not be soon forgotten.
The reason I cannot rate this 5 stars is that it will be very hard to play with friends that do not know Japanese, especially as I myself cannot understand everything on the cards. In all fairness, the English version would also get the same rating, as I doubt I would have been able to introduce it to the friends I played this version with.