Izumi (Yuu Shinoda) worked in the accounting department at her husband's company, where she met tax advisor Ichikawa, and their relationship gradually turned into a secret affair. Despite trying to keep their involvement hidden due to their professional connection, her feelings for him grow stronger, forcing her to continue the relationship against her better judgment. Tormented by guilt, Izumi becomes increasingly entangled with Ichikawa, drawn into his intense and abnormal sexual desires. Though Ichikawa realizes her emotional attachment and refuses to break things off, Izumi finds herself unable to resist his seduction, growing ever more dependent on him.