Kyoko is a young woman with short black hair and small eyes. She wears a pair of black glasses and a white shirt under a green hooded sweater with a gray hood.
Kyoko enrolls at To-Oh at the same time as Light Yagami and L. When Light and L (under the alias "Hideki Ryuga") are giving their speeches at the entrance ceremony, Kyoko comments that she likes the one on the right, referring to L. Her friend strongly disagrees with her, saying that Light is better looking.
Kyoko is seen again when Light and L have their tennis match. When one of the other students returns to the tennis court with news that Light was a former Junior High tennis champion, Kyoko points out that Ryuga (L) is holding his own.