Thinking of the German Language: A Collection of Articles on the Language 三修社 2008
German from the Viewpoint of the Far Neighborhood. Japanese Insights into a Foreign Language. Festschrift for the 60. Birthday of Susumu Zaima. Sauffenburg Verlag 2005
Grammaticalization in German - from the Viewpoint of the Typology - NEUE BEITRAEGE ZUR GERMANISTIK (日本独文学会編)、Iudicium Verlag 2004