- 2015 - 2018 A study of vocabulary of "Manyo-Shu" from the viewpoint of etymology
- 2010 - 2012 A study of the vocabulary of "Manyoshu" from the view point of expression
- 2007 - 2009 A history of ancient literature from the viewpoint of "the Border"
- 2004 - 2006 A Research of a romance and a legend in the Chinese character cultural sphere in Asia
- 2003 - 2004 アジア漢字文化圏における物語と説話の研究
- 2001 - 2003 An Intensive Research on "Manyo-shu"
- 1997 - 1998 An Intensive Research on "NIHON-RYOIKI"
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