Koguma, a high school girl living a solitary and uneventful life in Yamanashi Prefecture, finds her world transformed when she purchases a used Honda Super Cub motorcycle. Initially acquired as a practical means of transportation, the Super Cub becomes a catalyst for change, opening up new experiences and connections. Through her daily rides, Koguma begins to explore her surroundings, discovering the beauty of the countryside and the simple joys of independence. The motorcycle becomes a symbol of her growing confidence and self-reliance.

As Koguma becomes more adept at riding and maintaining her Super Cub, she meets Reiko, a fellow student who shares her passion for motorcycles. Reiko, who rides a more advanced model, introduces Koguma to the broader world of motorcycling, including maintenance tips, scenic routes, and the camaraderie of fellow riders. Their friendship deepens as they embark on rides together, sharing moments of adventure and quiet reflection. Reiko’s enthusiasm and expertise inspire Koguma to push her boundaries, both on and off the road.

The narrative also introduces Shii, a younger girl who becomes fascinated with Koguma’s Super Cub. Shii’s curiosity and eventual involvement with the motorcycle add a layer of mentorship to Koguma’s journey, as she begins to share her knowledge and experiences with someone new. Through these interactions, Koguma’s life becomes increasingly intertwined with the people around her, gradually breaking her isolation.

The story emphasizes the mundane yet profound aspects of daily life, focusing on the small victories and challenges of owning and riding a motorcycle. Themes of self-discovery, friendship, and the transformative power of simple pleasures are woven throughout the narrative. The Super Cub itself is central to the story, serving as both a practical tool and a metaphor for personal growth. The series captures the rhythm of rural life, the changing seasons, and the quiet moments of introspection that come with long rides through the countryside.