In a parallel timeline set in 1899, mankind managed to utilize magic, with it being commonly used in various industries like plantations, pharmaceuticals, military etc. However, there seems to be a "curse" as a person who overuses magic would transform into a insane monster bent on killing, refered to as a "Demon". To combat the Demons, tactical Sorcerists are used to kill the monsters, donning combat-based armor based on the "Mold suit" technology to ensure one can use magic without fear of becoming a Demon. However, a left wing terrorist group is tampering with Mold suits leading to an increase in demon attacks. Among those who fight the Demons is a rouge Sorcerist named Reiot Stainbarg, who also battles against a sin he had committed long ago.

- From Wikipedia