The book 'Tensai kantoku Kinoshita Keisuke' (literally, Genius director Keisuke KINOSHITA) by Hideo OSABE includes a testimony from his former wife that they separated without any sexual relationship and this shows that their separation was similar to what is known today as a "Narita divorce" (a divorce immediately after the honeymoon).
性的関係のないまま離別したという相手の女性の証言は長部日出男「天才監督木下恵介」に紹介されており、今で言う成田離婚に近いものであったようである。