Кумико Агэмаки

Кэя's younger sister. A charming and energetic child, very fond of her older brother. Like her mother, Kumiko is capable of sensing the presence of even invisible yōkai. It turns out that she has a yōkai pet called Itsue, whom only she can see from the entire family. Kumiko also saw through Zakuro at their first meeting. Since then, she has called her the "Precocious young lady".