ユギリ・プリネシカ

Yugiri Prinesica is the younger of the Yugiri twins. Unlike her energetic sister, she is calm and quiet, and has a frail body. She likes to watch over her sister and seems to be very attached to her. In the beginning of the story Prine is a first-year student at the academy. Later on she joins the Tsuge Office together with Pelselthe for the sole purpose of being with her sister. [Combined descriptions from Wikipedia in Japanese and Wikipedia in English.]