Manga by author Torikai Akane

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

Somewhere, in Asia, in the future... For several years now, men have hardly been born. The latter are often reduced to their role of reproductive partner. Society is built around a matriarchal system. Neither wars nor conflicts disturb the daily life and the balance. But some have decided to flee the city. They settled outside, in a slum. This is where Sanada resides. Sanada has a secret... a secret that could well stir up the lu** of her fellows.