He also wrote theory books of Nohgaku such as "Fushikaden," "Shikado" and "Kakyo," trying to establish Nohgaku in the fields of performance, writing Noh dramas and theory.
『風姿花伝』『至花道』『花鏡』といった能楽論を執筆して、実演・実作・理論の諸方面で能楽の大成につとめた。