Married for three years with no children yet, 30-year-old Asuka is uncertain about her first affair. Her nights with her husband have grown infrequent, and as she begins this illicit relationship, her innocent, girlish expression transforms into one of lewd, mature desire whenever he touches her. Through physical contact, new pleasures awaken within her, and during these forbidden moments, her true self gradually emerges. She mindlessly craves his cock, and the shocking transformation brought on by her choice to cheat unleashes an entirely new side of her sexuality.