"Butt Detective" is an anime series centered around the peculiar and humorous adventures of a detective with a unique anatomical feature—his head is shaped like a buttocks. The protagonist, known simply as Butt Detective, uses his distinctive appearance and sharp intellect to solve a variety of bizarre and comedic cases. Each episode typically presents a self-contained mystery, often involving quirky characters and absurd situations that require the detective's unconventional methods to unravel.

The series is episodic in nature, with Butt Detective and his assistant, a young boy named Brown, tackling a wide range of cases. These cases often involve minor crimes, misunderstandings, or strange occurrences in their town. Despite the comedic tone, the detective approaches each case with a serious demeanor, employing logical reasoning and deductive skills to uncover the truth. Brown, on the other hand, provides a more grounded perspective, often questioning the detective's methods but ultimately aiding in solving the mysteries.

The humor in "Butt Detective" is largely derived from the absurdity of the situations and the detective's unique appearance, which is frequently the subject of jokes and visual gags. The series does not shy away from slapstick comedy and exaggerated reactions, making it accessible to a younger audience while still offering moments of clever wordplay and situational humor that can appeal to older viewers.

Supporting characters include various townspeople, each with their own eccentricities, who often find themselves involved in the cases. These characters add to the series' comedic and unpredictable nature, contributing to the overall lighthearted and whimsical atmosphere. The animation style is simple and colorful, emphasizing the comedic elements and ensuring that the focus remains on the humor and the detective's antics.

Overall, "Butt Detective" is a comedic mystery series that blends absurdity with clever storytelling, offering a unique take on the detective genre. Its episodic structure and humorous tone make it an entertaining watch for audiences looking for a lighthearted and unconventional series.