"Class no Dai Kirai na Joshi to Kekkon suru Koto ni Natta" centers on the unexpected marriage between two high school classmates, Saki Saki and Akane Watanabe, who initially share a deeply antagonistic relationship. Saki, a popular and academically accomplished student, harbors a strong dislike for Akane, a quiet and reserved boy who often appears indifferent to her presence. Their mutual animosity stems from a misunderstanding during their first year of high school, which escalates into a tense dynamic.

The narrative takes a dramatic turn when Saki’s family faces financial difficulties, leading her parents to arrange a marriage with Akane’s family to secure their future. Despite their personal grievances, both families pressure Saki and Akane into agreeing to the union. The story explores their reluctant cohabitation and the gradual evolution of their relationship as they navigate the complexities of living together while maintaining their public personas at school.

As the series progresses, the characters are forced to confront their preconceived notions about each other. Saki begins to see Akane’s quiet demeanor as a reflection of his thoughtfulness rather than indifference, while Akane learns that Saki’s outward confidence masks her insecurities and vulnerabilities. Their interactions shift from hostility to tentative cooperation, with moments of humor and emotional depth as they adapt to their new circumstances.

The plot delves into themes of family expectations, societal pressures, and the challenges of communication. Secondary characters, including classmates and family members, play roles in shaping the protagonists’ journey, adding layers to the narrative. The series balances lighthearted moments with more serious reflections on the responsibilities and compromises that come with marriage, even in an unconventional arrangement. Through its exploration of personal growth and mutual understanding, the story offers a nuanced portrayal of two individuals learning to coexist and, ultimately, to care for one another.