The Onmyou Academy is the primary site of where the protagonist attend school, it is located in Shibuya. It was guarded by Alpha and Omega, but they were destroyed in the line of duty.
Over 50 years ago it was a private school Yakou created to spread his teachings, but after that it became open to anyone who passes the entrance exam. The current building was rebuilt twice, a year before the story began and after Douman's attack.
The school exists to educate practitioners of onmyoudou on the principles and guidelines of the craft, in accordance to the guidelines set by the Onmyou Agency.