Office worker Kaname from the sales department cannot stand his coworker Shinonome, a system engineer. The two are known throughout the company as the worst-matched pair, constantly bickering and avoiding each other. Despite their mutual dislike, a work-related situation forces them into a one-year contract marriage. Expecting the arrangement to be purely transactional and miserable, they move in together. On the very first night, a heated argument escalates into a kiss, which unexpectedly sparks intense physical attraction between them. As they continue to cohabitate, their initial hostility gives way to reluctant curiosity and gradually deepening feelings, all while they navigate the absurdity of their secret married life at the office. The story follows their journey from antagonistic coworkers to something far more complicated and intimate, exploring how their relationship develops over the course of their one-year agreement.