Nakazawa married his one-year younger coworker Sumire after falling in love at work. They were living happily ever after until they faced one problem; Nakazawa was suffering from impotence since their marriage. One day, he ran into his former boss, Ikeda, by chance. During their conversation about their current lives, Nakazawa confided in him that he wasn't having a good time in bed with his wife. To his surprise, Ikeda suggested swapping wives with his own wife Ruisa and Sumire.
