"Hikari no Densetsu" is a sports-themed manga centered around rhythmic gymnastics, blending athletic competition with personal growth and interpersonal drama. The protagonist, Hikari Kamijou, is a young girl with a natural talent for gymnastics, though her journey is marked by challenges and self-discovery. Initially, Hikari is portrayed as somewhat clumsy and lacking confidence, but her passion for rhythmic gymnastics drives her to improve and compete at higher levels. Her dedication and perseverance become central to her character arc.

The narrative explores Hikari's progression from a novice to a skilled gymnast, highlighting her struggles with self-doubt, rivalry, and the physical demands of the sport. Her relationships with other characters, including her teammates, rivals, and coaches, play a significant role in shaping her development. Key figures include her supportive but strict coach, who pushes her to excel, and her rivals, who challenge her to grow both as an athlete and as a person. The series delves into the competitive world of rhythmic gymnastics, depicting the intense training regimens, the pressure of competitions, and the emotional highs and lows experienced by the athletes.

Themes of friendship, rivalry, and perseverance are woven throughout the story, as Hikari navigates the complexities of her relationships and strives to achieve her dreams. The manga also addresses the sacrifices required to succeed in a demanding sport, as well as the importance of balancing personal aspirations with teamwork and camaraderie. Through its focus on rhythmic gymnastics, "Hikari no Densetsu" offers a detailed and engaging portrayal of the sport, while also exploring the personal journeys of its characters. The series combines athletic drama with emotional depth, making it a compelling read for fans of sports manga.