Kotomi married someone from her workplace and lived a happy married life for about five years. The number of times they had sex had definitely decreased... but she wasn't particularly dissatisfied. However, about a year ago, Kotomi's body began to change... She suddenly began to have the desire to have sex. She couldn't tell her husband about these feelings, so at first she tried to endure them by masturbating... But that alone wasn't enough, so she contacted an older man with whom she had had an affair once before. He was about the same age as her husband, but she realized that she might be falling for the energetic older man again... Gradually, they started meeting more and more often...