"S.A" (Special A) is a romantic comedy manga series that revolves around the lives of elite students at Hakusenkan, a prestigious private academy. The story centers on Hikari Hanazono, a fiercely competitive and determined girl, and Kei Takishima, her long-time rival and the top student in their class. Hikari has been striving to surpass Kei in academics and sports since childhood, but despite her relentless efforts, she consistently ranks second to him. This dynamic forms the core of their relationship, blending rivalry with an underlying mutual respect.

The narrative unfolds within the Special A class, a group of seven exceptionally talented students who receive exclusive privileges and resources at Hakusenkan. Each member of the S.A class possesses unique skills and personalities, contributing to the group's dynamic. Alongside Hikari and Kei, the class includes Ryuu Tsuji, a gentle and athletic boy; Megumi Yamamoto, a cheerful and resourceful girl; Akira Toudou, a sharp and calculating individual; Jun Yamamoto, Megumi’s protective older brother; and Yahiro Saiga, a quiet and enigmatic figure with a mysterious past.

The plot explores the interactions and relationships within the S.A class, with a particular focus on Hikari and Kei. While Hikari remains oblivious to Kei's romantic feelings for her, their rivalry drives much of the story's humor and tension. Kei, who is deeply in love with Hikari, often uses their competitions as a way to stay close to her, though his feelings are complicated by his reserved and stoic demeanor. The series balances lighthearted moments with deeper emotional arcs, as the characters navigate personal challenges, family expectations, and their evolving relationships.

As the story progresses, Hikari begins to confront her own feelings and the complexities of her relationship with Kei. The series delves into themes of ambition, self-discovery, and the importance of friendship, all while maintaining a comedic tone. The S.A class faces various challenges, both academic and personal, which test their bonds and individual growth. Through these experiences, Hikari gradually comes to understand her own emotions and the depth of Kei's devotion.

The manga combines elements of romance, comedy, and slice-of-life, creating a narrative that is both engaging and relatable. The characters' development and interactions drive the story, with each member of the S.A class contributing to the overall dynamic. The series concludes with a resolution to Hikari and Kei's relationship, offering a satisfying conclusion to their journey from rivals to partners.