Nanase, Rumi

七瀬留美

Rumi is a girl who transferred to Kōhei's school. She was previously in the kendo club but had to quit due to hip complications. Her goal is to become a "true maiden," and to that end, she behaves maidenly toward those around her, but she shows her true character only to Kōhei, who left a terrible first impression. She does not belong to any club, but she tries to join in literature activities. She likes her old school's uniform, and even though she has the new school's uniform in her possession, she continues to wear her old one. She is bad at putting her own hair into pigtails, and while she never says them herself, the phrases Kōhei imagines her saying are well-known by fans of the game.
From Wikipedia.