"My Sister and the Mirror" - Imotosekaga

...That is, there is the presence of an anonymous narrator who penetrates into the inner world of the protagonist, Utsumi Bunzo, while constantly resonating with a mocking voice. For example, in Shoyo's "Sister and the Mirror," in which the author takes the position of an "observer," the inner world of the characters is revealed through techniques of peeping and eavesdropping, but the narration of "Floating Clouds" opens up a style in which the reader can directly enter into the inner world. Mori Ogai's "Dancing Girl," in which the present and past experiences of recollection intertwine in a first-person narration, also achieves roughly the same effect.

*Some of the terminology used in "The Little Sister and the Back Mirror" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…すなわち，主人公内海文三の内面に入りこむとともに，たえずそれを揶揄（やゆ）する声を響かせる無人称の語り手の存在である。たとえば作者が〈傍観者〉の立場に立つ逍遥の《妹と背鏡（いもとせかがみ）》の場合，覗（のぞ）きや立聞きの手法をかりて作中人物の内面が明らかにされるが，《浮雲》の語りは，読者が直接的に内面世界に参入するスタイルを切りひらいた。回想の現在時と過去の体験が一人称の語りのなかで交錯する森鷗外の《舞姫》も，ほぼ同じ効果が発揮されている。…

※「《妹と背鏡》」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報