Mariko, a seemingly normal housewife, has been together with her younger husband named Tomoharu for six years and has been dissatisfied every day. Despite having a son together, Tomoharu is often absent from home and she suspects he might be having an affair. Her workplace, a batting center, is also a miserable environment because the sleazy manager chases after her and the customers are rude. With constant pressure bearing down on her in public and private, Mariko becomes dominated by a certain obsession that eats away at her perception of reality.