Five years have passed since Sumire got married after getting pregnant, the happiest day of her life. Her current situation is far from the married life she had imagined back then... After giving birth, her husband started coming home later and later each day, and she began spending more time alone at night. Then, six months after she stopped feeling the warmth of human skin, she reached out her fingers and found a smartphone with the word "adultery" written on the screen... As Sumire reached her thirties and felt a crisis as a woman, her "adventure called infidelity" began...