Tachibana

Serious, responsible, and excellent at her job. However, after being stuck between difficult management and inexperienced juniors for so long, her expression is as austere as her gaze is icy—even to her patients and colleagues. Tachibana's compassion and love for nursing have all but faded, and she attends to Yamada in a brisk, soulless manner, driven only by her stubborn sense of duty.

(Source: Steam)