Having completely dealt with Miharu, Ushio leads a healthy daily sex life. But one day that ends, on her way to school Miharu gets sick. She falls and ends up in the hospital. Ushio, along with Miharu’s sister, Futaba, immediately head there and wait for her to wake up. Miharu, upon awakening, remembers nothing about Ushio. She is also no longer the cheerful and confident Miharu that Ushio is familiar with. Instead, she is very strict and capricious. Futaba reveals that her sister was like this in the past before she met Ushio. As Ushio worries about what to do, he recognizes Futaba’s heavy breathing, flushed cheeks, and lust in her eyes. Despite his worries about Miharu, his desires crumble before Futaba’s seduction.