Chisato and the much younger part-time worker are only coworkers, despite an age gap large enough to be mother and son. After a lively event party makes them miss the last train, every nearby hotel is full except for a single shared room. In the awkward silence, Chisato begins complaining about her absent husband and gradually opens up when the young man listens with unexpected kindness. Her mature allure and his youthful body draw them together, their lips meet naturally, and the night turns into repeated sex and creampies.