Toshoshitsu no Kihara-san

The story takes place in the library of a research institute. This book chronicles the fun (and slightly strange) days of Kihara-san, a girl with a bob haircut and glasses who works there, along with her boss and coworkers.

(Source: Kadokawa, translated)

Note: Originally serialized in the obi as an "Obiura" manga in Harta magazine volumes 42-81.