City Of Dead Sorcerer.
Since a new substance called Mana is found in 2014, the world entered a race on how to use of this new unlimited source of magical energy.
It is now the Age of Magic, 16 years later where a mobile app can cast magic spells.
But there are severe restrictions, as well as difficulty required to use a high-level spell.
A mysterious somehow man appears, capable of performing very powerful and impossible magic, casting curiosity on what his goals are.