As an oil painter, Asō Saburō constantly sought for the meaning of human existence in his own artistic language. He investigated the inner self of human being, captured and deformed it on canvas with a distinctive, melancholy texture. In 1938, Asō quitted fine art school and left for Europe. Returning to Japan, Asō co-established the avant-garde artist groups Bijutsubunka-kyōkai and Shinjin-gakai, and became a member of Jiyūbi-kai. Later, Asō withdrew from all groups and societies, and had been active independently, putting up a great many solo exhibitions.