Komatsu Midori was born in Tokyo in 1891. From the age of five she studied at the Bando dance school and in 1911 joined a female theater which had just been formed, the Nakasu Masagoza.

In 1912 at the age of 21 she made her stage debut. In 1913 upon the invitation of Shochiku Gomei, she participated in the female theater group the Kyoto City Second Kyogoku Taishoza where she continued her activities until 1915, when she chose to take the path leading towards action pictures. In 1919 she negotiated with Kunikatsu films and the following year joined the company.