At a fireworks festival, an adult former student spots his teacher in a yukata waiting for her boyfriend. When work keeps the boyfriend away, the lonely teacher prepares to leave, but the man who has always loved her invites her to watch the display from a special spot. A sudden downpour soaks her yukata, exposing the outline of her skin and body. Unable to suppress his desire, he rushes into a shared room with her, where they stay wet and have sex repeatedly until morning.