I don’t remember much but it was a manga set in high school, and I think the bottom was ...

I don’t remember much but it was a manga set in high school, and I think the bottom was building something for like a school festival? It was metal and high? But then it tipped over and the top ran and grabbed it along with a bunch of other students. Homie was safe but the top was shitting his pants and wouldn’t let go for a while