Black Lotus: Twin Star Exorcists

"Impurity", abhorrent creatures from parallel world called "Magano" had terrorizing humanity for a thousand years. Ren Sasaki, an exorcist who lost his parent to those impurities swear to annihilate them all. "When you died, Where's your God?!" Say Ren with eyes full of contempt. What kind of ordeals he would face? What kind of future awaiting him? Is it a happy one or...?