JoJo's Bizarre Adventure, but it's in a School setting.

Everyone from JoJo's Bizarre Adventure part 1 - 6 is here. Everyone is alive like Jonathan Joestar.

This is a type of school for everyone, but more like a high-school. The older JoJo characters are teachers like Joseph Joestar, Lisa Lisa, and Kars. 

Some 'villains' are teachers, but here, they're mainly those unlikable Teachers or Students.

Like DIO here counts as a Student. Or La Squadra Esecuzioni members is a club with rude Students.