Emi has been married for three years and is happy, but somehow she feels unsatisfied. One day, when she loses her house key and is at a loss, she ends up waiting in the room of her shut-in neighbor, Sakuda... Sakuda, who has been secretly eavesdropping on the neighboring house, reveals that she is chronically sexually frustrated and unsatisfied with her husband's sexual activity, and forcefully pushes her down. Even though she resists, the intense stimulation she feels for the first time in a long time reminds her of the pleasure she once felt...