Yashou no Kito

“Sorcerer“...an accursed name given to the most feared heretics known to the world. Roan, one such sorcerer, lives a life worse than slavery, one forced upon him by a circus troupe. Things only change when he runs into Kito, a fellow sorcerer and a member of the Nightbells, a notorious vigilante group. It won't be much longer before these most hated of people are the very ones tasked with saving the world, in this magical fantasy exploding with style!

(Source: K Manga)