Japan has very little arable land. In fact, only 12% of its land mass is used for farming as compared to 45% in the United States.
Japanese fruit orchards are small and the cost of living in Japan is reasonably high. In order to make a living, Japanese orchards must grow premium products that fetch a high price on the market.
As a result, most of the fruit grown in Japan is high quality. It's common for each prefecture to grow its own unique varieties of fruit.
Japan has plenty of fruits that are worth a try: