Make your own "sort of" Ultimate Japan... First, Buy Mesh 2021 Japan and download Haruo's Landclass. Buy GEX Asia [and South America] for Texture options differing from the default FSX ones, if you're so inclined. (I had also tried BEV for another different set of Asia textures).
Then you can buy any of the Technobrain airports, or go to the Avsim Library and search Japan/FSX Scenery for individual free airports and some nice assorted photographic scenery efforts.(You can also buy commercial photoscenery I have seen for specific areas of Japan -- Like Fujiama, of course...)
(FS2004 had many more offerings and I made a pretty good Japan for myself...)