Blue Exorcist

Iwatani Naofumi, a run-of-the-mill otaku, finds a book in the library that summons him to another world. He is tasked with joining the sword, spear, and bow as one of the Four Cardinal Heroes and fighting the Waves of Catastrophe as the Shield Hero. Excited by the prospect of a grand adventure, Naofumi sets off with his party. However, merely a few days later, he is betrayed and loses all his money, dignity, and respect. Unable to trust anyone anymore, he employs a slave named Raphtalia and takes on the Waves and the world. But will he really find a way to overturn this desperate situation?

Yuji Itadori is a boy with tremendous physical strength, though he lives a completely ordinary high school life. One day, to save a classmate who has been attacked by curses, he eats the finger of Ryomen Sukuna, taking the curse into his own soul. From then on, he shares one body with Ryomen Sukuna. Guided by the most powerful of sorcerers, Satoru Gojo, Itadori is admitted to Tokyo Jujutsu High School, an organization that fights the curses... and thus begins the heroic tale of a boy who became a curse to exorcise a curse, a life from which he could never turn back.

Rokuro is from a family of exorcists, but he'd rather be a singer, a soccer player or anything but an exorcist! He's forced to own up to his own incredible potential when new arrival Benio stirs his competitive spirit. But their rivalry gets a twist when they earn the prestigious title of "Twin Star Exorcists"—two supreme fighters fated to marry and birth the ultimate spiritual warrior!

In his past life, he was known as Demon Lord Varvatos, an all-powerful magic user and ruler. But he was lonely after the loss of his friends and loved ones during his rise to power, so in his dying moments, Varvatos cast a reincarnation spell so that he'd get a second chance at just being a normal guy. At first it looks like that's going to work – he's reborn thousands of years later as villager Ard. Unfortunately for him, his memories are still intact and he's not aware just how much has been lost over the time he spent not existing, and it looks like that's going to cost him his normal life.