Yuu is a married woman whose bra unconsciously floats. She has been married for two years but has no sex with her husband. While an air conditioner installer is working, he becomes aroused by Yuu's exposed nipples and attacks her, cumming inside her. After that, he comes to her several times, but she becomes addicted to the pleasure of sex and their affair slowly becomes a drag... What awaits her after this marriage falls apart...?