Ambivalent: Dotei wo Sutetara Shinu Sekai

A global outbreak of a novel sexually transmitted disease causes a dramatic increase in female libido while killing 99% of infected men. In this world, engaging in casual sex becomes a fatal risk. Sadao Shindo, a man who has never had sexual experience, resolves to avoid any relationships until a cure is found. However, he faces increasing pressure from the allure of women.