Wataru Kaji was born in Kyushu in 1903. He became involved with activism. Kaji was charged with violating the Peace Preservation Law and threatening the Kokutai, resulting in his flight to China in January 1936. He arrived in Shanghai, where he married Yuki Ikeda. In Shanghai, Kaji was placed under suspicion for working with Japanese socialists by Chiang Kai-shek's Nationalist government.
Kaji was kidnapped in 1951 by U.S intelligence, and was held for more than a year.
Wataru Kaji died when he was 79 years old.
The Chinese Documentary series "Today In The History Of Anti-Japanese War" dedicated an episode to Kaji.
Wataru Kaji was featured in the "International Friends during the Anti-Japanese War". A show organized by the Beijing People's Association for Friendship with Foreign Countries. The show "features 160 pictures of 39 foreign friends who worked together with the Chinese people and made contributions to China's independence and freedom."
- Library of Congress Name Authority File. Accessed 19 January 2014
- Derek Challis (2002). The Book of Iris: A Biography of Robin Hyde. Auckland University Press. p. 542.
- Roth, Andrew (1945). Dilemma in Japan. Little, Brown. pp. 234–243.
- Esselstrom, Erik (2009), Crossing Empire's Edge: Foreign Ministry Police and Japanese Expansionism in Northeast Asia, University of Hawai'i Press
- Koshiro, Yukiko (2013). Imperial Eclipse Japan's Strategic Thinking about Continental Asia before August 1945. Cornell University Press. p. 100.
- Empire of Texts in Motion Chinese, Korean, and Taiwanese Transculturations of Japanese Literature By Karen Laura Thornber Page 75
- Literary Societies of Republican China edited by Michel Hockx and Kirk A. Denton Chapter 13 Page 458
- "Seminar: Home Away From Home: Displacement and Cosmopolitanism in the Itinerary of Xiao Hong". University of Hong Kong.
- From Vagabond to Journalist: Edgar Snow in Asia, 1928-1941 By Robert M. Farnsworth Page 326 -327
- From Kona to Yenan: The Political Memoirs of Koji AriyoshiBy Koji Ariyoshi, Alice M. Beechert, Edward D. Beechert page 104-105
- Empire of Texts in Motion: Chinese, Korean, and Taiwanese Transculturations", Karen Laura Thornber, Page 75
- Yakuza: Japan's Criminal Underworld By David E. Kaplan, Alec Dubro Page 47
- "Political writer Kaji died at 79". The Miami News.
- 抗战史上的今天 12月19日 鹿地亘对记者谈反战同盟 (in Chinese). 【抗战史上的今天】官方频道---纪念中国人民抗日战争暨世界反法西斯战争胜利70周年. Dec 20, 2015.
- "Int'l friends photo exhibition unveiled in Beijing". This is Beijing. July 23, 2015.
- 井上 桂子 (2012). 中国で反戦平和活動をした日本人―鹿地亘の思想と生涯. 八千代出版.
- Records of the Office of Strategic Services (Record Group 226) 1940-1947 | Entry 211 | Boxes 1-45. Location: 250/64/32/1. CIA Accession: 85-0215R. at the National Archives and Records Administration
- Pingchao Zhu (2015). Wartime Culture in Guilin, 1938–1944: A City at War. Lexington Books.
- Pingchao Zhu (2015). Wartime Culture in Guilin, 1938–1944: A City at War. Lexington Books. pp. 175–180.
- "중국과 함께 했던 외국적 항일투사(사적)7-가지 와타루". 국가공공추도망 (The National Memorial). 30 June 2015.
- "John Young Obituary". ObitsforLife.com.
- "Chinese Attack Japs Today Near Shanghai Limits". The Daily Times. May 23, 1938.
- "Japs, Despondent Over War, Reported Ending Lives". St. Petersburg Times.
- "Sino - Japanese friendship urged". Tribune.