The Rikugi is a book passed from Ze’ami to his son-in-law Konparu Tayū, or Zenchiku. It was passed on in March of 1428, when Ze’ami was 66 and Zenchiku was 24. The contents include the Kino-Tsurayuki, which explains the style of Noh in the context of the six styles of Japanese waka poetry as presented in the Kokinshū Kanajo, an early anthology of waka. It is kept in the archives of the Hōzanji temple in Ikoma, Nara Prefecture. It is a designated cultural treasure of the Nara Prefecture. Rikugi can also refer to a kyōgen script.