Kotomi married her coworker and had lived a peaceful married life for five years. Although their frequency of sex had decreased, she didn't particularly feel dissatisfied—until about a year ago, when her body began to change. She started feeling a much stronger desire for sex. Unable to talk about it with her husband, she initially tried to cope through masturbation. But it wasn't enough to satisfy her, so she reached out to an older man she'd once had an affair with. He was around her husband's age, and his energetic presence had always attracted her. Kotomi soon realized she was falling for him again, and their meetings gradually became more frequent.