Kana's husband asks her to "show me how I look in someone else's arms." And Sumire asks her husband to "see me in someone else's arms." These two couples, with opposing cuckold desires, attend a "married people's mixer" while hiding the fact that they are married. As the party progresses, Sumire disappears into a hotel with Kana's husband, Kenji. Kana is also an old friend of Sumire's husband, Takashi. Even after that, the relationship between the two couples continues to become complicated and intertwined...