"Super Cub" centers on Koguma, a high school girl living a solitary and uneventful life in Yamanashi Prefecture. With no family, friends, or hobbies, her days are marked by monotony until she purchases a used Honda Super Cub motorcycle. The scooter becomes a catalyst for change, opening up new experiences and connections that gradually transform her world. Through her Cub, Koguma discovers the joy of independence, the beauty of her surroundings, and the value of human relationships.

Koguma’s journey begins with small, practical steps as she learns to ride and maintain her Cub. Her initial trips are short and cautious, but they soon expand as she gains confidence. Along the way, she meets Reiko, a classmate who also rides a Super Cub and shares her passion for the vehicle. Reiko introduces Koguma to the broader world of motorcycling, including long rides, scenic routes, and the camaraderie of fellow riders. Their friendship deepens as they explore the countryside together, with Reiko serving as a mentor and companion.

The narrative also introduces Shii, a younger girl who becomes fascinated with Koguma’s Cub. Shii’s curiosity and eventual involvement with the scooter add another layer to the story, highlighting the impact of Koguma’s newfound passion on those around her. As Koguma’s skills and confidence grow, she begins to tackle more ambitious challenges, such as riding in adverse weather conditions and undertaking longer journeys. These experiences not only test her abilities but also reinforce her sense of self-reliance and determination.

The series emphasizes the simplicity and practicality of the Super Cub, portraying it as more than just a vehicle—it becomes a symbol of freedom, growth, and connection. Koguma’s interactions with her Cub and the people she meets along the way are depicted with a focus on everyday realism, capturing the quiet yet profound moments that shape her journey. The story unfolds at a measured pace, reflecting the gradual nature of personal growth and the subtle joys of discovering new possibilities in life.