On Zhuge Liang's Third Expedition, a secret military group called "Fei Yu" (飛羽)(meaning Flying Feather, deriving its name from the two famous generals of Shu kingdom - Zhang Fei and Guan Yu)carried out various missions in the war to further the interests of Shu. However, on the Fourth Expedition, Thanks to its own group of powerful secret operatives, Wei was able to discover and exploit critical weaknesses of Shu, prompting The Feathers to take action. The game addresses issues of loyalty and duty, as well as the harsh realities of warfare and peace.