In a quiet residential neighborhood, inside a single-family home, a beautiful married woman named Rei prepares breakfast in a spacious kitchen bathed in morning light. Today, however, is no ordinary day. Her husband packs his suitcase, leaving for a business trip that will keep him away for a full year. With his departure, Rei's days of loneliness and growing sexual longing begin. Three months pass. Unable to endure the emptiness any longer, stirred by memories of her husband, she picks up the phone and dials a certain number. At that moment, a new chapter unfolds.