Saint Who Fell From Heaven

Are there others out there in worlds just like ours? Bon-Bon Lee and her classmates experience this firsthand as they are transmigrated into a world known as Cypher. The unbelievable becomes real, but that fantasy quickly turns into a nightmare. The reason they are summoned? A problem that came from their own world, Earth. Now they and others must face what no mortal has ever faced before. Through this, they begin to ask the real questions. Why this conflict even began? Why in Cypher?