Memento Mori
Reapers' Game's Producer.
Towns Folk
I discovered this anime a couple of years ago and was hooked from the very first episode.
The anime mostly takes place in Academy City, a place where science is so advanced that it triggered the apparition of espers.
It follows the life of Touma and his encounters with enemies from inside Academy City (both espers and people without powers) as well as enemies from the outside (Magicians from the Church).
The main setting of the anime revolves around the conflict between Academy City and the Church, Touma being at the center of it all because his right hand can nullify any sort of power, be it from espers, magicians, and even godly beings.
Toaru Majutsu No Index currently has two seasons with 24 episodes each, and an upcoming movie.
There is also a side story known as Toaru Kagaku No Railgun, a side story that follows the life of one of the strongest espers in Academy city. It also has two seasons, each with 24 episodes.