Office lady "Haruna" is molested daily on her commute, leaving her increasingly anxious about wearing a yukata to the summer festival she had been looking forward to. Hoping to protect herself, she requests a transfer to a different workplace, but her boss denies the request and instead recommends she visit a mental health clinic. At the clinic, she is raped by a lecherous doctor, and under the training of her company's superiors and coworkers, gradually loses her sense of self. Molested relentlessly in crowded train cars, she endures 20 consecutive creampie orgasms—her body becoming the men's personal summer festival.