Today is a busy day for Mao Saito and her male colleague working together. As they have not completed the assigned tasks, both have to work overtime at the company. Enduring the pressure and the stuffy atmosphere in the office, Saito has to go outside to reduce the stress. Feeling unsatisfied, she starts to release her emotions by masturbating without knowing that her male colleague is secretly watching her graceful movements with desire. After a while, he is also discovered, but instead of blaming or feeling embarrassed, this promiscuous colleague unexpectedly invites him in to help, to satisfy her endless sexual needs.