He taught at the Waseda University starting in 1901, called Tokyo Semmon Gakko, at the time.

In 1901 he helped to found the short-lived Japanese Social-Democratic party, which the government swiftly prohibited.

When the anti-war newspaper Heimin Shimbun (People's Weekly News) was banned, he started his own magazine, Shinkigen (A New Era).

[1][5] He withdrew from politics in 1940 due to the increasingly militaristic nature of the government of the time.

[7] In 1905, during the Russo-Japanese War, he took the team to the United States and brought many techniques back to Japan, spreading them with his books.

After World War II, he also became the first chairman of Japan Student Baseball Association [jp].