While his wife was visiting her parents during her pregnancy, Kazuya struggled with unfamiliar household chores. However, despite his efforts, the house only became more chaotic. Just then, his wife's sister, Yuri, showed up offering to help with the chores. Though taken aback by the sudden visit, Kazuya was pleased. But Yuri's true intention was to satisfy her long-accumulated sexual frustration with her brother-in-law. Unaware of this, Kazuya, feeling completely at ease and well-taken care of, went into the bath. There, Yuri entered with a sinister smile, ready to wash his back…
