If it's an anime it would be the irregular at magic high school but if it's a video game then it would be persona 3. Either way my life just got a lot more interesting...
im gonna count mekakucity actors because theyre all students and there are some school scenes
and also because i cant remember what i watched before that
Unless you count Naruto Shippuden (which I don't, since they're not in the ninja academy anymore), mine would be... Natsume Yuujinchou! Awesome! :D Come on, Nyanko sensei, let's go and return some names! Right after you finish that squid and sake...