- Contemporary literature history of japan
- The impact of the views on wild words and flowery expressions in the history of japanese literature
- It is said that the tale of war represents a new literature genre of the middle ages in the japanese literary history
- His significant and inspiring contributions include : treating historical divisions of modem japanese literature on the basis of historical facts and literary works ; emphasizing the thought of " this life " and aesthetic features in japanese literature as a whole ; his research approach stressing a cultural perspective and " seeking differences in similarities "
他在近代日本文學史的史期劃分上重史實、重文學本體；在日本文學的總體特點上強調現世思想和“美之愛好” ；在研究方法上強調文化角度和“同中求異” ，這些都對后來者有重大的啟示意義。