DxD: Dawn in Abyss

A man who is thrown out of his time and into a world he doesn't understand and who has mysteriously gained huge powers and a new name finds himself in the middle of a world of conflict. However, he will soon discover that there is more to this world than what is written on the surface, as behind the curtain lies the truth of his arrival.

Note: Civil war timeline/OP OC/Harem/Slight AU/ Canon timeline in later chapters. It's a rewrite of my old fanfic.