Aki, who was molested on a train during her student days, has avoided commuting by train ever since due to the trauma. However, with her car breaking down, she is forced to ride the crowded train once again. Though she has always tried to avoid trains, reliving that painful memory, she finds herself boarding against her will and returning to that dreaded environment. Aki's sensitive body instinctively reacts to the sudden, lewd touches creeping close—her hips involuntarily swaying in response, accepting the contact. Despite feelings of disgust, there's a hidden hint of anticipation and arousal within her. Every day at the same time, she boards the same train, inevitably drawn into new incidents.