In the city planning process in 1920's under the City Planning Act of 1919, Okayama City showed the urban park planning belongs to a standard of Ministry of Interior. The standard was that the total area of the six species of urban parks is regulated in 6.6 m2 per person. Division of City Planning in Okayama City Bureau counted the historical Daimyo Garden such as Koraku-en established in 1689, Kairaku-en Park nominated for a park because of the existence of an important shrine and Okuichi Park around Shokon-sha shrine dedicated the sprits of war dead soldiers as the urban parks under the Act. Division of Forest in Okayama Prefecture that managed the Koraku-en Garden opposed this plan because the historical and cultural Daimyo Garden should be preserved as the heritage and proposed a plan the design on Misao-yama Natural Park as an alternate to keep the park area.
