Satomi married Hiroyuki and quit her job to become a full-time housewife. Soon after their marriage, her husband started coming home late, and Satomi began to feel lonely. The only way to relax was to visit her father-in-law, Toru, who had retired and was living alone. Toru was Satomi's boss at the company where she worked, and Satomi had always loved him because he was kind and reliable. Then, when Satomi found out that Hiroyuki was cheating on her, she sought comfort from her father-in-law, exposing her body to him and seducing him.