Housewife Ryoko Rinne met a man through a dating site introduced by a friend and gradually grew emotionally attached to him. Lately, she no longer felt warmth from her husband and longed deeply for comfort. Though nervous, she looked forward to spending time with the man—until an unexpected incident occurred. The man who appeared was none other than her husband's coworker. Their relationship was supposed to be temporary, but his actions began to escalate. Ryoko continued the affair in secret, but grew anxious over the coworker's frequent visits. As his behavior grew increasingly aggressive and possessive, her fear intensified. With his actions spiraling out of control, Ryoko struggled to find a way to protect herself.