When enrolling the Koju-in College, Ginko read various books and discovered in the book "Ryo-no-gige" (commentary on the Ryo) that there were female doctor-like persons in Japan from ancient times.
吟子は好寿院に入る際にいろいろの書物を捜した末『令義解』という本に、日本でも古代から女医らしい者があったことを突きとめた。