Saki Oishi, furious at her friend's husband who ignores his wife and continues his cheating ways, confronts him in hopes of making him see reason. Finding no sign of remorse, she gives up on scolding him and decides to uncover the root of his infidelity. Teasingly saying, "A dick that makes women throw themselves at you? If that's true, show it to me," she laughs—only to be met with an extremely thick cock. Long suffering from a sexless marriage, her body is shocked by its girth, and deep within her, a craving for new excitement begins to awaken.