- 2024 - 2028 Why Japan broke away from the Washington Treaty System: Historical Analyses with Commitment Problem and Audience Cost Theories
- 2024 - 2028 戦間期日本の国際連盟外交と対ヨーロッパ中小国外交-ポーランドを事例として
- 2020 - 2024 近代日本における自由主義的改革の系譜:「貿易立国」から「埋め込まれた自由主義」へ
- 2018 - 2021 A Study of Diplomatic History of Prewar and Postwar Japan Using the Diary of Suzuki Tadakatsu
- 2017 - 2020 Jpanese political history of "Liberty of Trade"
- 2015 - 2018 Reexamination of Diplomats' Career Paths and Factions in the Ministry of Foreign Affairs of Pre-War Japan
- 2007 - 2009 A comprehensive study to lay foundation of research on Hitoshi Ashida by conserving, organizing, and publishing his documents.
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