Time is the future. Karasu Miyamano, the son of the mayor of Nagasaki City, a village famous for its gold production and the world's strongest nation, located at the western end of Zipangu, was targeted by the suitman corps, which aims to monopolize the village's gold. Her older sister Suzume, who thought she could become the head of the family if her younger brother disappeared, was forced to protect Crow from the suitman corps after undergoing body modification by her father Tengu.