Nozomi Ikezaki and Shintarou Akishima are coworkers whose constant bickering makes them famous around the office as the most mismatched pair in the company. What no one suspects is that this combative relationship is a carefully maintained facade: the two have been secretly dating for nearly a year. Their company enforces a strict ban on employee relationships, so they must hide their romance from colleagues, constantly watching every interaction to avoid exposure.

Nozomi faces a double burden. Beyond the daily stress of keeping her love life hidden, she is increasingly troubled by thoughts of marriage. Age and social expectations push her toward considering a future with Shintarou, yet the man she loves presents a paradox. At work, Shintarou is the ideal employee: handsome, capable, and charming. In private, however, he transforms into someone entirely different. He is lazy, uncommunicative, and lives in a messy apartment, a stark contrast to his polished professional persona. This critical flaw—his complete domestic uselessness—forces Nozomi to confront a difficult question: can love alone make up for such a fundamental incompatibility in their vision of married life?

To test this, Nozomi and Shintarou decide to try living together. She hopes to reform his habits and build the ideal marriage she dreams of. Instead, the cohabitation highlights their differences ever more sharply. Nozomi becomes frustrated and nagging, while Shintarou, who feels he already expends all his social energy at work to maintain their secret, just wants to relax and be intimate at home without being scolded. As tensions simmer, Nozomi learns more about Shintarou's past—a history of casual relationships and underlying emotional wounds from childhood that contribute to his detached behavior. Their relationship is further tested by the arrival of a charismatic former sales ace from Shintarou's old department, whose attention toward Nozomi sparks intense jealousy. The strain leads Nozomi to temporarily move out and reconsider what she truly wants.

Ultimately, Shintarou must confront his own issues and make a genuine effort to change. The story follows the couple's rocky journey toward mutual understanding, whether their love can bridge the gap between Nozomi's ideal of marriage and Shintarou's deeply flawed reality, and what each is willing to compromise.