Ikebukuro, Tokyo. Mikado Ryugamine is a young man who yearns for the city like no other.

A massive earthquake ravaged Japan's mainland and destroyed most of Tokyo, sinking three-quarters of it into the ocean. Ten years later, the story shifts to Igarashi Ganta, a seemingly ordinary student attending Nagano Prefecture's middle school.

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.

The world of Blue Exorcist consists of two dimensions joined as one, like a mirror. The first is the world in which the humans live, Assiah.

When a great demon fox attacked Hidden Leaf Village, a powerful man known as the 4th Hokage had sealed the demon inside a newborn named Naruto, who then grew up detested by his fellow Leaf villagers. As a child, Naruto is isolated from the Konoha community, who regards him as if he was the Nine-Tails.