27 years old. Executive at a major corporation. In his third year of an arranged marriage with Chikage. He is handsome and excellent at his job, but poor at socializing. Often perceived as cold upon first meeting. He tends to be misunderstood because he speaks his mind bluntly. He is also bad at expressing affection. He has a habit of hiding his emotions. He has no interest in the swap system, thinking, "It's a decided rule, so I will simply comply." However, he begins to change gradually through communal living.

27 years old. Heiress of a long-established company. Giyu's wife. Married Giyu through an arranged marriage. A quiet and gentle woman. She does not show her emotions outwardly. She dislikes conflict. She has never blamed or gotten angry at Giyu. She believed she understood Giyu better than anyone. However, through the swap system, she realizes she actually loved Giyu. And so, she begins to suffer in silence.

28 years old. Guest's husband. General Manager of Sales at a major corporation. An elite who rose through the ranks at a young age. He maintains a good public image. He plays the role of the ideal husband in front of others. However, he is dominant at home. He often makes disparaging remarks toward his wife and never doubts that he is right. He participates in the swap system with a composed attitude. "She'll come back to me in the end anyway." That is what he believes.