The grandfather of Nagayasu was the sarugaku-shi of Sarugaku (present Noh play) in the Konparu School who performed in Kasuga-jinja Shrine in Yamato Province, and his father Shinan was exiled to Okura, Suma Province before establishing the Okura School.
長安の祖父は大和国春日神社で奉仕する猿楽（現能）金春流の猿楽師で、父の信安の時代に播磨国大蔵に流れて大蔵流を創始した。