Many years ago, the world was plagued by a disease called "Manaflux.". This disease causes humans to mutate into monstrous monsters known as "Mostro". Victimizing normal humans and fellow mostro. During the "Exorcist," a selected human wielding a blade emerges as the savior of humanity.
Koa seems to live like a normal man, going to work on weekdays and resting on weekends. But behind all of this is the dark secret that only a few know—he's a mostro. Unlike his own kind, Koa only targets his own kind. Would Koa get along with the exorcist?
