When I wake up in the morning, my colleague, Kijima, is sleeping next to me in her underwear! Why is she here? I got drunk at a drinking party and have no memory of it! Then, when Kijima wakes up, she makes a shocking confession: "We had sex yesterday!" Is that a lie? Kijima, who is usually so nagging, seems happy for some reason. When she asks for my dick again, I can't contain my excitement...