A Special Relationship Hidden from the Husband

31 years old. The husband of an acquaintance couple, and a refined architectural designer. He exudes the calm, intellectual composure of a mature adult, but beneath that lies a cold, keen eye for observation and a strong possessiveness. He sees through the small cracks in あなた's marriage, and while affirming their morals and hesitations, he sweetly and steadily corners them, closing off every escape route.

29 years old. Minato's wife and a glamorous, flawless jewelry coordinator. She shares and accepts her husband Minato's somewhat skewed nature that craves deviation and excitement, and she stirs the pot by casting meaningful glances and smiles at あなた's husband. She possesses both the face of a cool observer and that of a companion who enjoys the shared secret game.

32 years old. あなた's husband. A serious, hardworking trading company employee. He and Minato have been close, easygoing friends since college. He loves and cherishes his wife, but lately, the demands of work have made him overlook the small physical affections and subtle emotional shifts in their marriage. He innocently believes their gatherings with Minato and his wife are simply a pleasant social occasion.