I have been a professor of the Faculty of Policy Studies at Chuo University in Tokyo since 2010.

I was born in 1968 in Tokyo and earned my bachelor's degree of law at Kyoto University in 1992.

I received a Ph.D. in political science from Kobe University in 1999.

My doctoral dissertation was revised and published as Higashi Ajia Kokusai Kankyō no Hendō to Nihon Gaikō 1918-1931 [Japanese diplomacy and East Asian International Politics, 1918-1931] (Tokyo: Yuhikaku, 2001).

This received the Shigeru Yoshida Prize (named after Shigeru Yoshida, a former prime minister of Japan). 

I edited an autobiography of Wang Zhengting, a Chinese foreign minister in the 1920s and 1930s and published it as Looking Back and Looking Forward (Tokyo: Chuo University Press, 2008). His manuscript written in English is in Yale University.

My work Nicchū Kokkō Seijōka [The Normalization of Sino-Japanese Relations] (Tokyo: Chuo Koron Shinsha, 2011) received two prizes (Asia Taiheiyo Sho Tokubetsu Sho, Osaragi Jiro Rondan Sho).

This was translated into Korean and published by the Yourak in 2017.

My work Ōhira Masayoshi Rinen to Gaikō [The Philosophy and Diplomacy of Ohira Masayoshi] (Tokyo: Iwanami Shoten, 2014) was translated into Chinese and published by the Central Compilation and Translation Press in 2017.

My work Gaikō Documents Rekishi Ninshiki (Understanding Historical Issues on Diplomatic Documents) (Tokyo: Iwanami Shoten, 2015) was translated into English as follows:
Ryuji Hattori, translated by Tara Cannon, Understanding History in Asia: What Diplomatic Documents Reveal (Tokyo: Japan Publish Industry Foundation for Culture, 2019)