Kirishima is the childhood friend of Sakamoto. She is the top student in her level and the class representative for class A. In the story, she is portrayed as a soft-spoken, but highly assertive and intelligent girl. In the novel, her dialog always starts with ellipses. She is described as elegantly beautiful and very popular like a typical Yamato Nadeshiko, but yet has no boyfriend, which initially created the impression to others that she is a lesbian. She is in love with Yuji Sakamoto.