Ultimate Demon King - Male Reader X DxD Harem

In another world, under separate circumstances, existence, as it was, met its end at the hands of powerful demons and gods.

In said world, one demon, a boy cursed to survive such calamity, rummaged his way from the pits, clawing his way up to Lucifer, intent on knocking that crown into his own palms.

This man, with the soul of a human and the body of a demon, The Demi-Fiend, struck fear into the hearts of all who opposed him.

But that doesn't matter to Y/N, a student at Kouh Academy, who knows about none of this.

In fact, neither of these things are related at all.

At least in their worlds, but if these two worlds were parallels, nearly the same, but different enough.

Then what lines up with what, and who lines up with who?
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Harem
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P.S. It's Highschool DxD so you know what to expect ;)

Starting Arc: Finished

New Arc: Finished

Born Arc: Finished

Hero Arc: In Progress