School District 22 (第二二学区 Dai Ni Ni Gakku?) is the smallest school district in terms of surface area in Academy City, where most of it is located deep underground. It is bordered by School District 7, School District 18, and School District 10. Its borders are close to Touma's dormitory. Only 2 square kilometers, School District 22 is mainly used for developing technology for an underground complex in the faces of land shortages in major cities.