Gekokujo is a mod for Mount and Blade Warband set in the Sengoku period of Japan. The name is a term often translated as "the low-ranked taking over from the high" and was chosen because it was a running theme during that era: from the illustrious Ouchi clan--a belligerent party in the Onin war--being displaced by the Mori (their vassals); to the rise of Toyotomi Hideyoshi (who began his career as a cook and sandal bearer); to the beginning of the Tokugawa shogunate itself (Ieyasu was an upstart who probably fabricated a claim of descent from the Minamoto clan--the only ones allowed to be granted the title of Shogun in the first place). As a player of Gekokujo, you will start from nothing and attempt to gain control of the entire country, making the title even more fitting.
LordY has uploaded a Japanese translation for Gekokujo, for Japanese players
Posted by marty4286 on May 17th, 2013
Thank you very much LordY!
The translation file and the instructions on how to install it is on nexusmods, but it is small enough that I don't believe you are required to create an account in order to download it: Mountandblade.nexusmods.com
If I'm wrong, post it in the comments and I will ask LordY to allow me to upload it here on moddb