"Tenkōsei" is a romantic comedy anime series that revolves around the lives of two middle school students, Ryoko Kobayashi and Nobuo Nakamura, who find themselves in an unusual situation after a supernatural event. During a school trip to a local shrine, the two classmates accidentally trigger an ancient ritual that causes their souls to swap bodies. This sudden and unexpected transformation forces them to navigate each other's lives, dealing with the challenges and awkwardness of living as the opposite gender.

As Ryoko and Nobuo adjust to their new realities, they must maintain the facade of being each other while trying to find a way to reverse the swap. The series explores their daily struggles, including adapting to unfamiliar social dynamics, handling personal relationships, and confronting their own insecurities. Ryoko, now in Nobuo's body, must deal with his family and friends, while Nobuo, inhabiting Ryoko's body, faces the pressures of her social circle and expectations.

Throughout the series, the two protagonists grow closer as they rely on each other for support and guidance. Their shared experience leads to a deeper understanding of one another, as well as self-discovery. The narrative balances humor with heartfelt moments, highlighting the complexities of adolescence and the nuances of identity. The supporting cast, including classmates, family members, and friends, adds depth to the story, creating a rich backdrop for Ryoko and Nobuo's journey.

The plot progresses as Ryoko and Nobuo attempt various methods to reverse the body swap, often leading to comedic mishaps and emotional revelations. Their efforts to return to their original bodies are intertwined with their personal growth, as they learn to appreciate each other's perspectives and confront their own fears. The series concludes with a resolution that ties together the central themes of identity, empathy, and the transformative power of relationships.