The daughter and only child of the high school’s principal, who appears to behave as a rich man’s polite and elegant daughter should, but is revealed to be quite sadistic. She is shown to enjoy tormenting and teasing Kinjirō by using his gynophobia against him. She does, however, give serious thought to finding a way to cure his gynophobia although her methods tend to be overly complicated or humiliate him in some way and she does not deny that she finds them amusing. She notes that Kinjirō is the first, and only, man who is willing to talk her down and she has fallen in love with him as a result.
She has claimed that Subaru was her first love. And yes, she knew.