Read Shogun by James Clavell.
Doesnt really tell you that much about jap culture. Its mainly about the Dutch and English start to trading in the far east, guns being introduced to the land and because of that the beginning of the end of the era of the Samurai. Its still viewed from a fairly narrow perspective over about 5ish years iirc.
Like pretty much anything Clavell, I find the characters and story only class B (obviously the guy is a master at producing lots of accurate period pieces, but thats different from a ripping yarn), but if you are interested in the exact era depicted, you will still chew threw them. Iirc Shogun was a good 1K pages.