Yuu has settled into a stable life after remarrying, but gradually feels a growing emotional distance from her serious, work-obsessed husband. Though she had moved on from her divorce and built a new family, she senses a lingering emptiness in her heart. One day, a delivery man arrives at her door—and to her shock, it's her ex-husband. Holding a package, he knocks, and seeing him stirs a sudden flutter in her chest. Learning of her remarriage, he begins expressing his lingering dissatisfaction, and Yuu, hesitating in her words, starts to recognize his true feelings. Suddenly, he pins her down, and because she knows him so intimately, she finds herself unable to resist. Her body surrenders to pleasure while her heart wavers in confusion, ultimately accepting him once again...