Penguin☆Brothers, Pika☆Ichi Recommendations
An elite school, twisted into a nightmare for the students, by the students. A group decides to put an end to the madness, and restore peace. There is romance but the school, it's students, and the mob mentality are the main focuses.
It was similar with two students changing the school,the only difference is that the main boy & girl in pikaichi were invisible & their likeness of yakuza movies.