Nakazawa married Sumire, a coworker twelve years his junior, and begins a happy life with his young, beautiful wife. There is only one problem: since the wedding he has struggled with impotence and their sex life has fallen apart. A chance reunion with Ikeda, his former boss, leads to a candid conversation about marriage. After hearing the problem, Ikeda suggests swapping his own wife Ruisa with Sumire to see whether exchanging partners might reignite them.