Nobunaga s Ambition takes place during the Sengoku period of feudal Japan As the title suggests the player is tasked with achieving the ultimate goal of warlord Oda Nobunaga the conquest and unification of Japan Selecting Oda Nobunaga is optional however as the player is also able to choose from a variety of other regional daimyos of the time This game introduced castle towns and unified castle sieges The administration screens transitioned to full 3D