ainoko_kasai

Haruhi Fujioka is searching for nothing more than a quiet place to study in the most elite high school academy in all of Japan when she stumbles across the mysterious third music room. Inside she encounters six beautiful men, the members of the host club.

Angel Beats! takes place in an afterlife high school, which acts as limbo for teenagers who have died and experienced traumas or hardships during their lifetime.

Ten years after the Holy War which happened in Hong Kong, Mochizuki Jirou, aka the Silver Blade, and the lone hero who fought and defeated the Kowloon Children despite the loss of his lover, returns to Japan with his young brother, Mochizuki Kotaro. The two quickly discover that the Kowloon Children who survived the Holy War are seeking to infiltrate the “Special Zone”—a thriving city protected by an invisible barrier that will not allow Kowloon Children entrance—unless they’re invited.

Clannad is set in a high-school located in a town in Japan, which one isn't really specified. Okazaki Tomoya is a third-year student who doesn't take his studies seriously.