He graduated from Tokyo University (1912). He studied in Europe and U.S.A (1924-26).
He became professor of the 5th Higher School in Kumamoto (1912). Upon returning to Japan, he was appointed professor of Keijo (Seoul) University and then became dean of its Law and Literature Department. He was transferred as professor to Kyushu University (1939). Then he served as professor of Nihon University (1948) and lecturer of Nagoya University (1949). He was president of Aichi Women's Junior College (1950).
He was elected member of Japan Science Council twice (1951). Also he was active as member of Japanese Language Inquiry Commission.
First devoted himself to study of medieval literature but later turned to ancient literature. Meantime he published many unique treatises on literature in general and other subjects. His Yoshino-no Ayu (The Sweetfish at Yoshino), published in 1941, contains his essays on the three major classics of the ancient literature, namely Kojiki, Nihon-Shoki and Manyoshu, and caused considerable repercussions in the field because of the new and effective way in which various problems are proposed and solved upon the basis of the literary theory of Europe. His Kobungeisho-ron (Qn Ancient Literature) also drew attention for the same reason. His other works include Nilion-Bungaku-no Kankyo (The Circumstances of Japanese Literature) and Kohan (By the Lake).