As a member of the Kurosawa-gumi (production team) screenwriting group, he co-wrote screenplays including those for "Ikiru" (To Live) and "Shichinin no Samurai" (Seven Samurai) with Hideo OGUNI.
以後、黒澤組のシナリオ集団の一人として、小国英雄とともに『生きる(映画)』、『七人の侍』などの脚本を共同で執筆する。