Kokoro Kisaragi is a gamer who streams online under the handle Koroneko. She once aspired to become a professional gamer, but after arriving late to a tournament she realized the competitive path was not suited for her. She aims to stream every day, yet she rarely manages to begin her streams on time. While streaming, she tends to use harsh and critical language toward her viewers, but when a single viewer remains after others have left and offers her kind words, she is visibly affected by the gesture. This interaction defines her role in the series, appearing in the third episode as a gamer girl whose encounter with the protagonist leads to the signature scenario of the show. Her only depicted relationship is with that protagonist. Little information is available about her character development beyond this episode. Her notable ability is her proficiency at third‑person shooter games, which are her favorite genre.