- 2020 - 2024 Towards an Accomplishment of the Meiji Political and Diplomatic History: Transition of Hegemony from Satsuma-clique to Choshu-clique amid the International Relations of the Far East
- 2023 - 2024 戦後日本の都市開発についての政治史研究:港湾から臨海部への転換
- 2020 - 2022 港湾法制定時の地方公共団体側の活動
- 2017 - 2020 New Understanding of the Meiji Japan based on the German Archives; Diplomacy and State Building
- 2016 - 2020 近代日本の都市政治と新聞
- 2013 - 2016 Aquisition and assessment of Japan-related diplomatic documents in Germany
- 2013 - 2016 A Political History of Trading Ports: Grand Designs for Nation States and Local Interests
- 2011 - 2012 戦前期日本海沿岸諸港の競合
- 2010 - 2012 Local Governance as Multi-organizational Cooperation to Secure the Livelihood of Inhabitants
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