humanity and youkai once lived in harmony but was now broken after the incident at the shrine temple the human wage and humanity won but so many lives had been taken youkai and humans, that made the youkai's hidden themselves In the deep forest or city but an organization was made "Hunter Organization, RSA Branch" still hunting down youkai's along the way with a Sakura flower as a symbol of the organization eversince the organization was made there are four best friends who was victimized by the organization of RSA that made them created the four organization also called the "big four" the north , south, east,and west. the north represent as loyalty, freedom, and intelligent the south represent as kindness, nobility and amiability the east Represent as cold, cunning and Limerence the west represent as Nefarious, Limerence and Ethereal the four best friends created there own organization after the war conflict between humanity and youkais the RSA hunting organization was made to hunt down youkai's while the big four was the protection/protectors of the youkai