Kokoro Inogashira is one of the students of Class 1-D. In the first volume of the light novel, Kokoro was the second person who introduced herself after Yōsuke Hirata during the class introduction. Being a timid girl as she is, she can't help but stutter during her rushed introduction making her feel embarrassed about herself. After Kikyō Kushida reassured her that she's going to be fine as long as she takes time in building up her words, Kokoro was immediately relieved and delighted. Kokoro claimed that her hobby is sewing that makes her good at knitting clothes and stuff.