It was considered that the head of the Sugawara clan established the private school for lecturing on the Kidendo for students who were asking the head to teach them, besides performing his official duties at the Daigaku-ryo (Bureau of Education under the ritsuryo system).
菅原氏の当主は大学寮における公的な職務以外に、自宅にこうした私塾を開いて教えを請う学生たちに紀伝道を講義したとされている。