"Kamen Rider SD" is a short anime series that reimagines the classic Kamen Rider franchise in a super-deformed (SD) chibi-style format. The narrative centers around the adventures of various Kamen Riders, who are reimagined as diminutive, comedic versions of their original selves. The story unfolds in a lighthearted and whimsical manner, blending action, humor, and parody.

The main characters include Kamen Rider 1, Kamen Rider 2, and Kamen Rider V3, who are portrayed as heroic yet comically exaggerated figures. They face off against the Shocker organization, a recurring antagonist group in the Kamen Rider universe, which is also depicted in a humorous and less menacing light. The Riders' battles against Shocker's monsters and plans form the core of the episodic plotlines, with each episode featuring self-contained stories that emphasize slapstick comedy and over-the-top action.

The series incorporates elements of the original Kamen Rider lore, such as the Riders' transformation sequences and signature moves, but presents them in a simplified and comedic fashion. The tone is consistently playful, with a focus on entertaining younger audiences while paying homage to the franchise's legacy. The interactions between the Riders and their enemies are marked by exaggerated expressions, rapid-fire gags, and a general sense of absurdity.

Despite its brevity, "Kamen Rider SD" captures the essence of the Kamen Rider franchise while offering a fresh, comedic take on its iconic characters and themes. The series serves as a lighthearted entry point for newcomers and a nostalgic diversion for long-time fans of the franchise.