Yoshino was born in Takasaki city, Gumma prefecture, as the second son in a family of textile wholesalers.

He relocated from Tokyo to Kamakura in Kanagawa prefecture in 1924, due to its reputation as a healthful environment for people with lung conditions.

However, his health condition steadily worsened in 1926 and 1927, deteriorating from asthma and bronchitis to dyspnea, and with the development of painful anal fistula which required surgery.

In the immediate post-war period, Yoshino was an instructor at the Kamakura Academy, and made a lecture tour together with Masao Kume and Masajirō Kojima to Niigata.

His anthologies include Seiin shū ("The Clear and Cloudy Collection", 1967) and Kansen shū ("The Autumn Cicada Collection", 1974).Yoshino also wrote a number of essays, including Yawarakana Kokoro ("Soft heart") and Korokono Furusato ("Home is the heart").