After marriage, Miho Toono retired from work to become a full-time housewife. Her husband, Kentarou, ranks at the top in sales performance and enjoys success outside the home, but their marital relationship has grown stale and routine. Conversations have dwindled, and the couple's bond is gradually weakening. Meanwhile, Tarou, Kentarou's boss, is a divorcee who remarried a woman two decades younger—Mao Hamasaki—and frequently brags about his new wife. When Kentarou complains, "I'm completely fed up with things at home," Tarou invites the couple over, saying, "You two seem down lately—come over to our place." That night, the couple experiences mutual NTR for the first time, sharing an intensely thrilling evening. Soon after, the encounter escalates into a creampie-filled foursome orgy. A new dynamic begins to form among the four, sparking a chain of transformative events.