Shadows of Mysteries(Shadow Slave X LOTM)

Gray, an highschool junior reader from the 21st century finds himself transmigrated into the world of Shadow Slave as anomaly in the world. In a universe where even God's are unable to deter fate and corruption. can a young man from a different reality wielding a power not witnessed before survive and save humanity from its closely impending doom or will he also become a victim of the destruction?