After three years of dating a man who turned out to be already married, twenty-eight-year-old Miko carries deep trust issues and has thrown herself entirely into her career. Hoping to move forward, she reluctantly joins a dating app and matches with a rather plain-looking thirty-five-year-old man who goes by the handle "Mochiro." Despite her wariness, she finds herself drawn to his gentle, earnest demeanor. When she confesses her fear of being let down again, he tells her, "I'm the type who grows when you expect things of me."

The story takes a sharp turn when Miko realizes that Mochiro is actually her company's vice president, Momochi, a wealthy and strikingly handsome executive she had only ever admired from a distance. Beneath his polished professional exterior, Momochi is surprisingly awkward and inexperienced with women; his entire adult life has been devoted to work and study, leaving him completely inexperienced in romance. What begins as a cautious reentry into dating evolves into a secret office relationship as the two navigate the gap between his public reputation and his private insecurities.

The manga follows their relationship through three volumes, covering the initial shock of discovery, the tentative first dates, and the growing intimacy that brings both joy and complications. A secondary narrative arc involves Yoshizawa, the vice president's sharp-eyed secretary, who suspects the romance and creates tension by testing the boundaries of their professional secrecy. As Miko and Momochi grow closer, they must balance their feelings with workplace discretion, while Momochi's jealousy and protectiveness flare in unexpected ways.

The story's central conflict hinges on trust and timing: Miko struggles to believe that a man of Momochi's status could genuinely want her, while Momochi, despite his powerful position, hesitates to push the physical side of their relationship. The final arc builds toward a birthday trip where both characters confront what they truly want and whether they are ready to fully commit to each other.