Mio Kimijima, a faithful wife who lives with her husband, works part-time five days a week and full-time. However, without her husband's knowledge, she is summoned to the public restroom on her way home from work by a middle-aged man from her part-time job. "I think we can work something out about the hourly wage increase, Kimijima-san..." he says, luring the part-time wife into a multipurpose fuck session in the station restroom. Her husband, who knows nothing about it, is happy about his wife's hourly wage increase, but the wife's body and Kokoro are gradually corrupted by the daily acts...