Some Hoan-ko (storeroom for displaying the goshin-ei portrait and the Imperial Rescript on Education, the predecessor of Hoan-den) remain within the schoolhouses where the school preserves old schoolhouses or auditoriums that were built in the prewar period.
戦前建築の古い校舎・講堂を持つ学校では、校舎内に設けられた「奉安庫」が残る所もある。