Azuma, an adult exam candidate living alone in Tokyo, gets new neighbors: a married couple whose nightly sex is impossibly loud. He can hardly believe the cries belong to their elegant, beautiful wife, but the noise soon ruins his studying. When he finally goes next door to complain, she tells him sex matters more than studying. Her husband cannot satisfy her overflowing desire, so Azuma becomes the extra partner she needs. With endless free time and an insatiable appetite, the married woman eagerly devours his young, energetic cock.