Yuuzuki Kiryuu

Yuuzuki Kiryuu is Mikazuki's older sister and a teacher at Gakushū Senior High, serving as homeroom teacher to Keita and Miharu. Before teaching, she worked at a clothing store because of her interest in Western-style clothing. A series of misunderstandings gives her a wildly inaccurate impression of Keita's relationships. Away from school she is a secret otaku who has a samurai interest and enjoys cosplay, spending enough on her hobbies that she often lives on instant noodles.