Keiyakukon Shita Aite ga Oni Saishou deshita ga, Kono Tabi Saishoushitsu Sennin Hosakan ni Ninmei Sareta Jimi Bunkan (Hensou-chuu) wa Watashi desu.

Tired of the fashionable romantic idealism of “love above all,” Christine decides to marry Leon, the notoriously workaholic High Chancellor, on the condition they remain a marriage of convenience. Three years later, disguised under a secret alias, Christine works tirelessly as an ordinary civil servant at a job she loved. Until she got promoted, and her new boss turns out to be… her husband!? She found herself conflicted between the joy of professional recognition and the frustration of him not recognizing his own wife— “Here, please enjoy this dessert.” Swept up by his sweet, tender attention, maybe her secret identity isn't so secret!? A story about being doted on at work, a secret hidden behind a contract marriage! (Source: Beans Bunko, translated)