Miho, a beautiful wife who lives with her husband, works full-time five days a week and part-time. However, without her husband's knowledge, Miho is summoned to a public restroom on her way home from work by a middle-aged man who calls himself the "Manager." "It looks like we can work out the wage increase, Michino-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...