Sengoku: Japan Universalis (Hooked Gamers)

Sengoku is set in 15th century feudal Japan, a time of great upheaval for an empire that is on the brink of falling apart. After being the single most powerful entity in the empire for almost 200 years, the Ashikaga Shogunate is left weakened through internal feuds and treachery. Smelling blood, some clans take up arms to strengthen their powerbase, others take up arms simply to defend themselves. Warfare and treachery threaten to rip the island nation apart from the seams.