Momoko was asked by an acquaintance to start patrolling for molesters. With a strong sense of justice, she boards the commuter train every morning in high spirits. However, when she lets her guard down and thinks, "It's not like an old lady like me...", a molester takes advantage of her... Her body, which hadn't been played with for a long time, remembers the joys of being a woman, and she reacts sensitively, forgetting that she is on a train. Momoko, who had intended to catch the molester, ends up shaking her hips at the molester herself, and today she boards the crowded train with a guilty conscience...