Chika, a new employee who missed the last train at a drinking party at work, takes advantage of his wife's return to her parents' house due to a fight, so he comes into the house. She fell asleep as soon as she got home and started playing a trick on Chika, but Chika didn't show any signs of waking up and couldn't resist, so she inserted herself. Later, she is threatened by Chika, who suddenly came to visit her on her day off, about "that night", and is toyed with by a new employee who is a little devil!