Yanase Konomi♀

Konomi is a 3rd-year student in Intermediary course. She thinks of Ritsuko and herself as ”sisters,” but Ritsuko doesn’t return her affections. (”Sisters” at Vincennes refers to a special closeness between two people). She burns in opposition to Masaya, whom she views as a threat to her ”Onee-sama.” Because Ritsuko’s views are so conservative, Konomi can view the symbol of reform, the protagonist, as no less than an enemy to defeat! But if you set those matters aside, she seems to bear Masaya no ill will.

Even so, she has no experience with boys, and she’s an extremely late bloomer, so she can’t even look him in the eye when they talk. She’s so shy that she can’t even pay attention during health classes. She believes that you can get pregnant by looking into a boy’s eyes for ten seconds. Her title ”Mignon Poupee” means ”Darling Doll,” but she’s exceedingly strong -- in multiple senses of the word.
Her family owns the "Naginata Warfare Dojo: Zanzei Hall", which is where her grandmother tought trained her in the arts of the Naginata.

”I-I will do anything to protect my Onee-sama!”

[From MangaGamer]