Yamamoto Kansuke is a lonely genius of strategy at the Age of the Civil War in the 16th century. Kansuke works under Takeda Shingen and pursues his dream of unifying the whole country through aiding the warlord of Kai. At the same time, Kansuke supports Shingen's concubine Yu from his selfless affection for the woman who hates but eventually loves the warlord who killed her father and family. With the aid of Kansuke's strategies, Shingen expands his power northward, where he is destined to fight with Kenshin Uesugi, the warlord of Echigo. The drama portrays how those who fight for their dreams face their destinies in the turbulent age.