Protagonist Michiru Toriyama has been married to her husband, Aoi, for three years. Michiru had been working hard at her career, but she quit her job when she married Aoi. She was happy in her marriage at first, but now Aoi does not see her as a woman, and she feels distance between her and her husband.
One day, a single envelope is delivered to Michiru.
It was a brochure from Buffet, an adultery subscription service that facilitated adultery safely for married people. She also learns that her best friends from high school, Yuki and Eriko, are already committing adultery through the subscription service. Buffet The service also guarantees secrecy. Yuki, who has experience using the adultery service, says “I do subscription adultery so that I can continue being pretty for my husband's sake.”
Michiru feels disdain for the unethical adultery service Buffet. However, her husband will not allow Michiru to return to work and all simply complains all the time, while Yuki who is actually committing subscription adultery is enjoying herself. This leads Michiru on the path to adultery.
Yuki gives her a push, as if she were simply going into a new hobby, and Michiru decides to give it a go. Before long, she's engulfed in this all-you-can-meet adultery subscription service, where she can meet a wide range of men, including CEOs, doctors, chefs, hot younger men, etc. and she goes on numerous secret dates while spending more and more money…
With the promise of “safe adultery,” her hidden desires rush forth--