The year is 1575 in feudal Japan. Oda Nobunaga's (Kippei Shiina) forces defeat Takeda Katsuyori, when Nagashino Castle was besieged during the Battle of Nagashino. The next year Oda Nobunada decides to build a lavish new castle symbolizing his unification of various factions. The castle named Azuchi Castle will be built near water and high enough to be seen from the capital city of Kyoto.