Seven Sisters High School is a school considered to have very high standards in Sumaru City. It is the high school attended by Tatsuya Suou, Anna Yoshizaka, and Lisa Silverman. Several other important characters also attended the high school; Tatsuya Sudou was a senior, Katsuya Suou an alumnus, and Akinari Kashihara was the World History teacher. The emblem of the school is based on the Pleiades constellation, which is also the school's namesake. Aside from the school uniforms, all clocks in the school as have the emblem in their faces.