A female college student who grew up in a wealthy family, and a younger half-sister who doesn't even know who she is. She is a young and mature mother-in-law. A variety of dazzling, sexy, and slightly sentimental stories set under the scorching midsummer sun, centered around a mysterious and strange man who enters their lives. A unique experience unfolds in a seaside town.

Ryoko Watanabe is a bored housewife named Ami who throws herself into the “Madame Machiko Society Club” to spice up her marriage by making love to random men. This world of lust turns out to be kinkier than Ami thought it would be and may end up having a reverse effect on her precious marriage.