Aiden

A web-series anime by Rooster Teeth about four girls who start attending a school for raising Hunters against the Grim and other threats to the fragile peace of the world. Generally considered to be the first "'anime-styled' anime" of the west to go to Japan.

Set on the fictional year of 2010, the world has been split into 3 superpowers: The Holy Britannian Empire (the Americas; also called Britannia), the Chinese Federation (Asia), and the European Union (Europe and Africa; previously known as the Euro-Universe. Also known as Europa United in Akito the Exiled).

It’s been one year since the failure of the Black Rebellion and the supposed death of Zero. Britannia has assigned Area 11 a “correctional education” status, where Elevens are made an example of by brute force, to try to prevent any future uprisings and suppress rebellious thoughts.

Isei finds new troubles about to enter into his life and two even sleeping in his bed. While looking at an old photo album of Isei's, Kiba sees a familiar sword being held by an old friend of Isei's, which reopen's old wounds.

The story follows Issei Hyodo, a dim-witted, lecherous second-year high school student who is killed by a girl on his first date ever. Issei is reincarnated as a devil, and from that day forward, he serves as an underling of Riasu, a high-level devil who is also the prettiest girl on Issei's campus.

The third season of High School DxD based on the light novel series by Ichiei Ishibumi. It's following Volumes 5 till 7 in a rearranged order by Ishibumi-sensei himself.

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.