Harukana Ii (井伊 遥奈, Ii Harukana) is I's little sister.
Harukana is one of the few people who knows of I's true name
When Harukana was young, she was kidnapped by the Kunagisa Organization. When I and Tomo Kunagisa met, he still didn't know of his little sister's existence, even though she was living almost right beside him.
Harukana dies in an airplane accident.