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

synopsis

Shinnosuke and his friends are enjoying a one-week stay as part of the "defense force" of Tenkatoitsu Kasukabe Private Academy (nicknamed "Tenkasu"), an elite boarding school that is administrated by a state-of-the-art AI. But when Kazama is attacked, with his intelligence reduced, and strange bite marks left on his butt, the mood begins to change. The Kasukabe defense force joins forces with the school's dropout student council president Chishio Atsuki to form a group of detectives and shed some light on the mystery.