There are Star Wars costumes on sale everywhere. You can be Darth Vader for ¥108,000 (there are cheaper versions, though... but lightsabers not included) or stormtroopers, or be a Wookie or Master Yoda.
And there are corners in book stores selling Star Wars books. There are even English readers for those interested in learning English through the Star Wars story (Episodes 1 to 6).
Star Wars is also in toy stores. Lightsabers, masks, toys, Lego, collectibles...
And tickets for the upcoming Episode VII "The Force Awakens" is already on sale!
The Force is awakening in Japan!