Kitahara Kaori

She has recently developed labyrinthine hypersensitivity. Worried about her abnormal body, she goes to the protagonist's hospital, which she saw in a magazine. The protagonist convinces her that what she suffers from is hyperacusis.

Her husband is a serious civil servant, and the only man she has ever had is her husband. She has not given birth yet, so her body is not out of shape.