Kuroha Keiko (黒羽競子) was a classmate of Karin, and was her rival. She is 13 years old, and her birthday is July 30. She has short black/red hair and brown eyes. Keiko came from a very rich family. Her bloodtype is AB. She is 155 cm tall, and weighs 44 kg.

Keiko was on the student council, and was the class representative. She liked Takuma, and always thought that Karin was making a play for him when actually Takuma was chasing Karin.