Yui lives happily with her kind husband. The only thing she is dissatisfied with is that her husband doesn't take her from behind during their nightly activities. One day, Takero, a senior from her university days, moves into the apartment next to hers. Yui is delighted to see him again and takes care of him by bringing him a home-cooked meal. However, seeing Yui in her unguarded state, Takero becomes aroused and attacks her from behind. Yui experiences multiple orgasms from the fierce thrusts she never gets from her husband and gradually loses her resistance…
