An ace student at Kikyo Private Academy. Kaoruko is incredibly intelligent and kind, but often acts airheaded as well. She greatly enjoys eating sweets, meeting Rintaro in his family's cake shop and quickly befriending him. Despite later learning that he attends Chidori High—a school at bitter odds with her own—she continues to be close with him.

Spoiler

Later, Rintaro confesses to Kaoruko and shortly after she returns his feelings, revealing that she has had feelings for him for much longer than what Rintaro remembers as their initial meeting.