The young man who was staying at his boss's house accidentally fell for his boss's wife, Saeko Matsushita. During a party with her husband and his subordinates, Saeko, although she didn't know how to drink, still drank a glass to honor her husband, resulting in her getting so drunk that she had to be supported into the bedroom. During this time, the young employee took advantage of the situation to kiss her without her knowing.
The next day, when Saeko's husband went to work, she was raped by that young employee, but gradually the pleasure he brought her turned Saeko into a promiscuous woman.