The world is filled with women trapped in marriages defined by domestic violence, sexless relationships, arranged unions without love, and the exhaustion of raising children alone. For these women, the only escape appears to be an affair. Kyūsai Furin is an anthology of interconnected short stories, each centered on a different married woman who seeks solace or salvation through extramarital relationships.

The setting is contemporary Japan, where social expectations and family pressure weigh heavily on wives. Each story follows a similar arc: a woman suffering under a specific form of marital misery encounters a man who offers her something her husband cannot—attention, kindness, or physical passion. The first story introduces Yuina, a woman enduring her husband's alcoholism and domestic abuse. One evening she stumbles into a newly opened shot bar, and the bartender becomes her confidant and eventual lover. In another arc, Mio was pressured into a loveless marriage for family reasons; she reconnects with an old high school boyfriend, reigniting a relationship that fills her emotional void. A third storyline follows Shiori, a mother frustrated by her husband's complete lack of involvement in childcare. She begins an affair with a popular male teacher at her son's nursery school, finding the validation and support her home life lacks.

The narrative does not judge the women's choices but presents their actions as a desperate response to systemic neglect and abuse. The series raises the central question: Can infidelity truly be a form of salvation? Each arc explores a different motivation for adultery—to accomplish a personal goal, to forgive oneself, to create an idealized version of oneself, or to discover one's true identity. The final volume concludes the omnibus, leaving the answer ambiguous but emphasizing the complexity of the women's circumstances.