To strengthen bonds with her gym friends, Shinobu decided to participate as a reviewer at a massage parlor. This particular spa specializes in lymphatic massage performed between partners, creating a relaxing atmosphere where they stimulate each other's bodies. However, during the session, Shinobu becomes emotionally overwhelmed and loses control of her inhibitions. Despite feeling guilt over betraying her husband, she is enveloped by the warmth of her friend's affection and takes the step forward into forbidden pleasure.