On a rainy night, the private lodging he had booked turned out to be double-booked. Unable to contact the management company, married woman Ren and office worker Tatsuya, strangers to each other, end up spending the night together. Amidst awkward conversation, they notice each other's loneliness and, under the same roof, are drawn to each other. Each time they seek one another, the distance between their hearts grows closer. On a night filled with the sound of rain and thunder, as if to fill the void of longing for her husband on an overseas assignment, their bodies, once intertwined, can no longer be stopped. Knowing that the morning of parting will come, they sink into the sinful lust of an illicit affair.