Her husband is harmonious, but she spends her days in gloom due to being childless. One day, her brother-in-law Kyoichi visits for a Buddhist memorial service… With his strong sex drive and love for women, Kyoichi relentlessly probes the carnal desires hidden deep within her. 'I was just swept away...' she tells herself, ending up in a one-time relationship with him. But the intense caresses that surpass those of her husband, and the stimulation of his penis piercing through to her brain, quickly overwrite her sense of pleasure. And before she knows it, Umi is drawn into the secret affairs with her brother-in-law…
