After graduating from jinjo elementary school (elementary schools that existed until 1941), Mizoguchi engaged himself in the design of yukata (Japanese summer kimono), and then, sponsored by his sister, he studied at the Aoibashi Western Painting Institute in Tokyo, which was organized by Seiki KURODA.
尋常小学校卒業後、浴衣の図案化に奉公し、姉の援助を受けて黒田清輝主催の東京葵橋洋画研究所に学ぶ。