"Oshiri Tantei Cosmic Front" is a children's anime series that blends comedy, mystery, and adventure, centered around a unique protagonist named Oshiri Tantei, or Butt Detective. The titular character is a detective with a literal butt for a face, who solves various whimsical and lighthearted cases with the help of his assistant, Brown, a talking dog. The series is episodic, with each episode presenting a new mystery for the duo to unravel.

The mysteries often involve quirky and imaginative scenarios, such as stolen desserts, missing toys, or strange occurrences in the neighborhood. Oshiri Tantei employs his signature catchphrase, "I smell a mystery!" to signal the start of an investigation. Using his keen sense of smell and deductive reasoning, he gathers clues and interrogates suspects, often leading to humorous and unexpected resolutions. The cases are designed to be simple and engaging for younger audiences, with a focus on problem-solving and teamwork.

Supporting characters include Brown, who provides comic relief and assists in investigations, and various recurring figures such as the mischievous thief, Nasal Hair, and the eccentric inventor, Dr. Strange. The interactions between characters are playful and exaggerated, contributing to the show's comedic tone. The series also incorporates educational elements, subtly teaching lessons about logic, observation, and cooperation.

The animation style is colorful and vibrant, with exaggerated character designs that enhance the show's comedic and surreal atmosphere. The episodic structure ensures that each story is self-contained, making it accessible for viewers to jump in at any point. "Oshiri Tantei Cosmic Front" is aimed primarily at a younger demographic, offering a blend of humor, mystery, and light adventure that encourages curiosity and critical thinking in a fun and entertaining way.