From the Koei Tecmo website: NOBUNAGA’S AMBITION: Sphere of Influence is the 14th entry in Koei's long running historical simulation series Nobunaga's Ambition, set during the Sengoku period, and centers on the life of Nobunaga Oda (1534 - 1582). There are scenarios that lead up to his death and events that occurred afterwards, such as the Battle of Sekigahara (1600). Sphere of Influence marks the 30th Anniversary of the series and the English release version comes included with the major expansion called the "Power-Up Kit” that was released in Japan.