In the throes of a summer storm, two long-time friends, Usaki and Inaba, find themselves alone and horny. They strip down to their panties, their bodies glistening with sweat and rain. Inaba's hands roam over Usaki's curves, cupping her breasts and pinching her nipples. Usaki moans, grinding against Inaba's thigh. They kiss, tongues entwined, as Inaba's fingers slip into Usaki's wet panties, stroking her clit and plunging into her pussy.