One night, Kasumi accidentally witnesses intimacy between her husband and daughter. This comes as a shock to a woman who is accustomed to valuing family values ​​and home. Trying to save her family and pretending that she didn’t see anything, every day she feels more and more superfluous and unnecessary. A neighbor intervenes in the situation, who has long had his eye on Kasumi’s body. He intends to show her stupid husband that married women are always in demand.