He formed 'Yonki no kai' (film directors) with four members consisting of Akira KUROSAWA, Keisuke KINOSHITA and Masaki KOBAYASHI in 1969 and wrote the script of "Doraheita" together.
1969年（昭和44年）には黒澤明、木下惠介、小林正樹と4人で「四騎の会(映画監督)」を結成し、『どら平太』の脚本を共同で執筆。