At the beginning of chaos, the world was divided into two stars, the East and the West, and they yearned for each other across the sky. Under the protection of the Dragon Envoy, they developed very different civilizations. In the East Star during the Warring States Period, the Owari Fool Oda Nobunaga (voiced by Mamoru Miyano) and his subordinates Akechi Mitsuhide (voiced by Takahiro Sakurai) and Toyotomi Hideyoshi (voiced by Yuki Kaji) witnessed the amazing power of the powerful armor of the Takeda family and were deeply moved. At the same time, the beautiful girl Jeanne d'Arc Kaguya (voiced by Yoko Hikasa) from the West Star was regarded as a person possessed by the devil because she could hear the apocalypse. One day she met the genius inventor Leonardo da Vinci (voiced by Tomokazu Sugita), who secretly drove away the Taketori and brought Jeanne d'Arc and the newly developed armor "Oshi Armor" to the East Star. Nobunaga accidentally activated the Oshi Armor that the people of the West Star could not control, and he became the legendary savior king. He named Jeanne d'Arc Ranmaru, and this woman has since become the most important existence in the life of the fool Nobunaga. During the chaotic times of the Warring States Period, the battle between the East Star and the West Star is about to begin...