Taeko Nagafuji (永藤 妙子)

Nagafuji Taeko is a high school student and Shimamura's friend. She is introduced in Chapter 2 of the light novel, along with her close friend Hino Akira. Nagafuji has a very laid back personality and sometimes just seems to be out of it.

(Source: Adachi to Shimamura Wiki)