Japan

Land of the Rising Sun, the 1.9 major update of Mission Expanded, might be considered not as massive as the others update since it mainly focus on Japan.
However, you'll be surprised at how much more you'll enjoy playing Japan, not only as a whole, with its two branching major trees and customised events, but also by the numerous all new ways of uniting Japan as some of the most popular Daimyos in History. You won't find another country wich you can play several times in a row and still feel the varied flavors in each playthrough.