In 1907, he was scouted by Miyake Setsurei and changed to the Nihon oyobi Nihonjin ("Japan and the Japanese") magazine.

A few years later, he returned to newspaper journalism by changing jobs to the Osaka Asahi Shimbun.

His writings reveal his leftist political leanings, and in 1918, he resigned in protest after the newspaper was censured by the government.

Increasing government repression and application of the Peace Preservation Laws in the mid-1930s, resulted in Nyozekan's arrest and a brief period in prison.

Surprisingly to some, although Hasegawa wrote essays protesting that journalism must remain neutral and above politics, he also wrote in favor of the Greater East Asia Co-Prosperity Sphere, in which he saw the potential for the favorable development of Asia economically and culturally under Asian, rather than European influence.