Oshiri Tantei

is the name of the titular character of its children's book series published by Poplar Inc. An anime series adaptation produced by Toei Animation began broadcast on NHK E-Television where the first season premiered from May 3 to August 25, 2018; the second between December 1, 2018 to March 30, 2019; and the third between July 6 to September 28, 2019. The fourth season began premiere April 4, 2020.

The series had two 2 short half-hour movies.

Plot
A polite and meticulous super sleuth known as the Butt Detective solves a myriad of baffling mysteries, blowing raspberries in the face of crime.