The On hakase belonged to Daigaku-ryo (Bureau of Education under the Ritsuryo system), and taught hakudoku (pronunciation of Chinese language in kanon (Han reading of Chinese characters)) of Keisho (most important documents in Confucianism) to gakusho (students) of Myogyo-do (the study of Confucian classics).
大学寮に属して、明経道の学生に経書の白読（中国語（漢音）による音読）を教えた。