Maki, having divorced her previous husband just three months prior, spots a seemingly happy brother and sister while walking through town. In that instant, she sets her sights on them as her new target and resolves to get close. She successfully wins the brother's engagement and marries him. However, what Maki had in mind was never a simple love story—it was the beginning of a new game. After marriage, she reveals her true demonic wife persona to her timid husband and devises one trap after another to keep her sister-in-law, Nozomi, from escaping. But when Nozomi realizes Maki's true intentions, she resolves to fight back and begins her own revenge. How will the twisted relationship between these two women unfold as they become entangled in Maki's cruel schemes?