Rinko Akiyama

She is a Taimanin that attends Gosha Academy, as a senior with her best friend, Yukikaze, and younger brother, Tatsuro. On top of being the substitute head of the Akiyama clan, she also teaches the "Itto Style" in the Dojo to multiple students and is known as Gosha's strongest sword user.

(Source: Taimanin Wiki)