- 2024 - 2028 Human Identity and the Functional Change of the State: Focusing on Globalization and Informatization
- 2021 - 2024 Comparative historical study of judicial statistics in Japan, the United States, and European countries
- 2020 - 2024 Nationality and Residence: A Study on the Cross-border Movement of People under Globalization
- 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
- 2019 - 2024 Japan-France-Germany joint research on the transformation of the citizenship of immigrants and its impact on host societies
- 2019 - 2024 Multi-layered Structure of Global, National and Local Laws and their Coordination
- 2019 - 2022 外国人労働力受け入れの法理論-社会統合法制を中心として
- 2017 - 2021 comparative studies of public Laws with historical contexts in the era of globalization
- 2017 - 2021 The Legitimacy of Policy- and Law-making under Globalization
- 2017 - 2020 New Understanding of the Meiji Japan based on the German Archives; Diplomacy and State Building
- 2016 - 2020 Enforcement and Dispute Resolution in the Globalized Policy Cycle
- 2016 - 2020 Rights of Refugees in the Context of Integration
- 2015 - 2016 移民法領域における国際人権法の援用-強制退去の事例における人権保障を中心に
- 2013 - 2016 Migration policy and family protection. Migration Law in an era of globalization.
- 2011 - 2013 Equality of Voting Rights in German Federal Election and Constitutional Court
- German Law/Migration Law
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