In a Crossover World: The Biblical God Adopted by Gabriel

After transmigrating into the world of High School DxD, Allen was adopted by Gabriel, one of the Four Great Seraphim.

He also obtained the Godhead of the Biblical God.

He had thought he was starting with every advantage and could lie flat all the way to the top of the world.

But then Michael, thinking of retiring, wanted to hand the world's System over to Allen.

Wasn't that just throwing him into a pit of fire?

That very night, Allen left Heaven!

From then on, he left his footprints in the human world, the Underworld, Hades, the Fallen Angels' headquarters, and Mount Sumeru.

Grayfia: "I am willing to serve Lord Allen."

Serafall: "+1! Anything Grayfia can do, I can do too, and there are things I can do that she can't!"

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.