Crayon Shin-chan: Shrouded in Mystery! The Flowers of Tenkazu Academy

The film's story begins with Shinnosuke and his friends of 'Kasukabe Defence Force' experiencing a one-week stay in 'Tenkatōitsu Kasukabe Private Academy' (nicknamed 'Tenkazu'), an elite boarding school that is administrated by a state-of-the-art AI, 'Otsmun'. All the students are given a badge initially with 1000 points and their points are increased/decreased by Otsmun based on their behaviors and academic performance. In there someone attacks Kazama. As a result, his intelligence is reduced, and strange bite marks are left on his butt. The Kasukabe Defense Force joins forces with the school's dropout student council president Chishio Atsuki, who was a former athlete, to form a group of detectives and solve the mystery.(Source: Wkipedia)