Tonari no Mesu Tsuma

Yui, a housewife, is deeply dissatisfied with her sexless marriage. She soon becomes aroused by the sounds of her neighbor, a college student, having sex with various women. Eventually, she approaches the young man and they begin a passionate affair, with him filming their sexual encounters. Yui becomes completely addicted to the neighbor's large penis and rough sex, finding her husband's eventual attempts at intimacy entirely unfulfilling.