Mei, a married woman who works part-time at a gyudon chain, becomes friends with a fellow university student. She is attracted to a serious and sincere young man. One day, since they both arrived at the same time, she went out for drinks and they ended up having an affair at the hotel. After that, she continued to do things with him after her part-time job, in the store during a break, and even in the kitchen during business hours, and she realized that her body was the best compatibility with him...