Sara is too sensitive and always climaxes quickly during sex. Their married life also ends up being cut short due to her reaching her limit before they can finish having sex. Feeling unsatisfied with their relationship, Sara's husband encounters one of his former coworkers at a bar and decides to drink with him. However, despite being drunk herself, Sara becomes aroused by her vulnerable state in front of this man. Despite being taken advantage of, she cannot help but feel something stirring inside her.
Another day, the two continue their intimate activities. As Sara gets deeper and deeper into this mess, she starts changing gradually. One day, Nobu returns home from work and accidentally witnesses Saras relationship with three-root. Being timid, he doesn't say anything about it, but continues to enjoy watching them together. Over time, Sara undergoes significant changes in her behavior due to her intense experiences with three-root. Although her husband feels regretful about not being able to stop her, he finds himself increasingly drawn to watching her sexual exploits...*Note that recording contents may vary depending on distribution method.