Nanako, a wife of a bank branch manager, is in her first year of marriage. They are a very happy couple and want to have a child soon. One day, after finishing her coffee after breakfast and seeing her husband off to work, the doorbell rings. Nanako opens the door without being careful and ends up being pinned down by a group of strange men. Then, as the men are about to rape her, the only thing she can say is, "Today is my dangerous day... please... don't cum in my pussy..." What will become of Nanako, who refuses to let her husband cum inside her pussy because she wants to have a child with him?