Ask for an animation about the protagonist catching ghosts in a school, which is very good and fun.

The story happened in Cheng Teaching Garden Middle School. Because of its long history, many incredible events are widely circulated on campus. One day, Shinichi Shintani, a teenager, got lost in the maze of school buildings. At sunset, a dark-haired girl appeared in his sight. The girl is wearing an ancient school uniform that she has never seen before, and her empty eyes are full of sadness. Did I meet a ghost? I'm really excited to think so.