Akiko, Haruka, and Fuyumi, all married women living in a housing complex, are living unsatisfied lives as a married couple. The three of them learn about each other's existence after Haruka posts something on the internet. Haruka suggests swapping to Akiko, but Akiko's husband, Kuriichi, doesn't understand, so she goes out alone to play with Haruka and his wife, where she awakens to a new self...

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