A heavy off-season downpour strikes the Japanese archipelago, halting all train services. With every business hotel fully booked, Tsugumi Akari is forced to rush back to her office, drenched to the bone. She has no choice but to spend the night at work—until she realizes her most detested superior, Nakata, is also stranded. Left alone together in the office, Nakata can't help but notice Akari's soaked shirt and the lingerie visible beneath. The unexpected situation rapidly draws them into a forbidden intimacy.