She usually has a very bubbly and likeable personality, though she is more a follower than a leader when it comes to their group of friends.
Long dark blue hair and blue eyes. She is usually seen wearing her school uniform.
We find out Kyoko's name in Chapter 9 when she is possessed by a black fog, but we see her as early as the first chapter when Sumire gets back to the dorm after curfew. She is also one of the human shields used by the virus Lucia came to kill that night.
In Chapter 18 when she comes to visit Sumire with the other girls, we find out that they are all 14 years old, only a year younger than Lucia.