Konishi (小西) is a student in class 1-C.
Konishi has shoulder-lenght dark violet hair, topped by a white headband, and light violet eyes, she also wears the standard school uniform of Hoshinoumi Academy's Middle School.
Konishi is madly in love with Oikawa, another student of Ayumi's class, since the boy was attracted from Yū's sister, Konishi wants to get rid of her rival, Konishi is a yandere; because she apparent seems to be a polite, shy and kind girl but later turns out to be a sadistic, violent and aggressive girl.
She has a crush on her classmate Oikawa, but ever since Ayumi transferred at school, Oikawa seems to have forgotten about her, later, she attempts to kill Ayumi with a box cutter, but fails after Ayumi awakens her "collapse" ability and destroys the school building, after Ayumi's death, Yū uses the "time-leap" ability to revert the incident, Yū appears to bluff Konishi and makes her run away in fear.
- Konishi is the first yandere character in the KEY series.
- Because of her actions that caused Ayumi's death and Yū's depression, Konishi became the most hated character in this series by fans.
|Main Characters||Yū Otosaka • Nao Tomori • Jōjirō Takajō • Yusa Nishimori • Misa Kurobane • Ayumi Otosaka • Shunsuke Otosaka • Takehito Kumagami|
|Supporting Characters||Maedomari • Medoki • Shichino • Furuki • Sala Shane • Kazuki Tomori • Yumi Shirayanagi • Tsutsumiuchi • Konishi • Udō • Arifumi Fukuyama • Saitō • Iori Sekiguchi|
|Minor Characters||Mishima • Kōta • Shō • Nomura • Oikawa • Sugimoto • Takato • Yoshiyuki Ōmura • Mrs. Tomori • Gondō • Hosoyamada • Mr. Kurobane • Mrs. Tomori • Honoka|