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A married couple, Ichiko and Otoya Aihara, have been together for seven years and maintain a good relationship, though their marriage is sexless and childless. They agree to pursue relationships with others. Otoya begins an affair with Mitsuki, and Ichiko is aware of this. As she observes Otoya's happiness with Mitsuki, Ichiko begins to change as well. The story explores the dynamics of their evolving situation, revealing the complexities of their relationship and the realities of their marriage.