Manami Kamijou presents herself as an ordinary office worker, secretly holding the position of the fourth candidate in an arranged marriage engagement with wealthy heir Akihito Saeki. She initially relies on her low ranking to minimize obligations. Her situation takes an unexpected turn when she starts a new job and finds Akihito is her direct supervisor. Oblivious to her identity as a fiancée candidate, Akihito treats her solely as an employee, and Manami actively maintains this anonymity to prevent workplace complications.

A pivotal revelation overturns Manami's standing as the lowest-ranked candidate, significantly altering her position within the arranged marriage hierarchy. This discovery sparks increased interactions with Akihito, unexpectedly accelerating their relationship. Despite Manami's initial reluctance and confusion over the changing dynamics, the emotional distance between them steadily decreases. Their professional rapport evolves into personal closeness, with Akihito demonstrating genuine interest in Manami beyond their formal arrangement. Their bond progresses from concealment toward a mutual, though unspoken, acknowledgment of their connection. Manami navigates the complexities of balancing her concealed identity with her burgeoning feelings, culminating in a significant development where the barriers between them rapidly dissolve.

The narrative concludes with both individuals moving towards a deeper relationship, transcending the initial framework of a contractual engagement.