An ordinary human middle school girl in 3004. When she was around 11, her father adopted another girl, Rumi, and the two quickly became close friends. By the time they were both 13, however, Kiyomi had begun to grow jealous of Rumi's friendships with her own friends.
Voiced by [Endou Aya](https://anilist.co/staff/95054/) in the radio drama adaptation of BLUE DROP.