Riku and Mao secretly carry on a romantic relationship at work. With Riku constantly away on business trips, their lives fall into a pattern of missed connections. During this time, they steal secret kisses and embrace each other in hidden corners of the office, unable to suppress their growing sexual frustration. When Riku finally returns from his trip, they reunite at the company and promise each other, "Tonight will be the night," looking forward to finally being together. However, unexpectedly, they are forced to stay late for overtime work. Disappointed at first, the moment they find themselves alone in the office, their pent-up desire erupts uncontrollably. Unable to resist any longer, they impulsively give in to passion right then and there...!