Kaoruko Nanahara

Kaoruko Nanahara (七々原 薫子 Nanahara Kaoruko) is one of main characters in Sakura no Sono no Étoile and another main protagonist of Futari no Elder.

Her onee-sama is Kana in the dormitory building. Kaoruko and Kana is called reverse sisters because she is 170 centimeters in height and Kana is short. She has a 3-dan in kendo and she is called Knight no Kimi after winning the fencing against an ace of fencing club; Kana's onee-sama Mizuho instructs her in fencing before the match.

She's often lost in admiration of a beauty and Chihaya Kisakinomiya's smile charms her at the first time in the dorm. She has complex for her femininity. She ask Chihaya instruct her in it. She knows Chihaya is a male because of Junichi's notice, but she supports Chihaya and she becomes the seventy-fifth elder sisters with him.

Personality
Kaoruko has a rough personality because her mother died in her infancy and her father brought up her all by himself.

Relationship
Shizuka Nanahara

Kauroko's desceased mother.

Genzou Nanahara

Kauroko's father.

Kana Suoin

Kauroko's onee-sama.

Mizuho Miyanokouji

Kana's onee-sama. He instructs Kauroko in fencing.

Chihaya Kisakinomiya
Kauroko is one of few people who know Chihaya true gender, but she keeps it a secret. In the OVA, she confessed to Chihaya (return Chihaya's feeling in final chapter of manga).

Fumi Watarai
Fumi is Chihaya's maid and Fumi called her "Kauroko-sama"

Trivia

 * Kauroko is good at fencing,  but Chihaya Kisakinomiya is better than her.
 * Genzou Nanahara (Kauroko's father) operates consumer credit, her family had the misfortune of being broken up by borrowed money by the company and Kauroko has held a grudge towards her classmates before entering Seio Girls' Academy.