Misuzu Hara is a 24-year-old high school teacher who, four years earlier, endured a traumatic experience at the hands of Hayafuji, the then-boyfriend of her best friend Minako. She has never forgotten the experience, but she has kept it secret from Minako to protect their engagement, and has rationalized it to herself as having occurred to her due to her being a woman, even if it has continued to negatively impact her emotional well-being."