Butt Detective (2018)
Original title: おしりたんてい
Butt Detective is a 2018 Japanese-language animation series. It stars Yuko Sanpei, Ayaka Saito and Takahiro Sakurai.
A polite and meticulous super sleuth known as the Butt Detective solves a myriad of baffling mysteries, blowing raspberries in the face of crime.