- 2016 - 2019 日独法学交渉史と現代日本法の形成に関する総合的研究
- 2011 - 2016 Crime and Society in East Asia
- 2011 - 2014 Japan and the change of the world order after the First World War: Study based on new "HARA Takashi Papers"
- 2008 - 2010 Reorientation of Notary-system from legal comparative point of view-the past, present and future of legal profession
- 2006 - 2010 Ceremony and Punishment in East Asia
- 2006 - 2008 Ito Hirobumi and governance of Korea -Japan's modernizaition and formation of empire
- 2002 - 2005 Law and Customs in East Asia - A study of Capital Punishments
- 1995 - 1996 Historical and Comparative Study on the Protection of Artifical Work (Kunstwerk) as Intellectual Property
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