Mariko, a housewife, works part-time at the same place where her son's childhood friend, Daiki, also works. She is impressed by his good work ethic every day, but one day, he confesses his feelings to her. "I've always liked you, Mariko!!" Although she is shaken, she gently declines and goes home, but her husband doesn't want her there either... After that, she gives in to Daiki and they go on a one-time date, but he confesses his love to her many times and she is shaken as a woman... This relationship should only be one time... Her body is burning with heat and she can't stand it, and they start having forbidden adulterous sex...