Kana often believes people's stories easily and gets carried away. One day, her brother-in-law, Taichi, accidentally helped him when she was about to be scammed. As a sea fisherman who has long lusted after women, he sees through her secret desires, and when he skillfully persuades her, Kana, who has lost momentum, is swept away, “If only once…”. A body becomes more and more sensitive when being fucked over and over again without being able to refuse. At some point, you will be overwhelmed by the lustful pleasure that invades your whole body, something you can never experience with a gullible husband.