Rin came to a festival with her childhood friend on a scorching summer day. They take refuge in the car from a sudden guerrilla downpour. In the enclosed space, her wet and see-through bra and the rain dripping between her breasts cause her childhood friend's pussy to swell. The two, who had never seen each other as the opposite sex, lose their reason and forget about each other's lovers, seeking each other in the car. an ntr story that began with a sudden rain.