In the late 1930's (Show Period 14), two sides in Japan are conflicted between joining Germany and Italy in a military alliance. At this time, Isoroku Yamamoto, who strongly opposed the alliance, is appointed Commander-in-Chief of the Combined Fleet. The following year, on September 27, Japan, Germany and Italy form the Axis alliance.
Isoroku Yamamoto leads the attack on Pearl Harbor on December 7, 1941. The attack's main purpose is to gain an early peace settlement. The surprise military strike appeared successful and caused massive damage, but US aircraft carriers were not damaged in the assault. After the attack the Axis alliance initially saw advances without any defeats.
Based on the life of Isoroku Yamamoto - Japanese Naval Marshal General and the commander-in-chief of the Combined Fleet during World War II.