Sparda's Children in DxD

Long ago, the human world and Demon world were at war. That is, until a powerful demon came along named Sparda. After defeating the ruler of the underworld, Mundus, Sparda used the perfect amulet with the temen-ni-gru tower to seperate the demon world from the human world. Sparda disappeared for some years before reappearing and falling in love with a human woman, disappearing once again shortly after. The human woman birthed two twin sons; Dante and Vergil.

After being separated as children, Vergil and Dante meet again after the former summoned the same Temen-ni-gru that his father used to seal off the demon world. Vergil is assisted by a human man but is later betrayed by the same man just before he completes his objective. The human man opens the gate to the demon world and is followed by both Vergil and Dante shortly after.

The man obtains Spardas sword and the demons power along with it. This power is quickly overwhelmed by Vergil and Dante.

Unable to agree with each other, the twin brothers decide to end their rivalry with one last battle...

Things do not go as planned and the twins are forced to travel to another world filled with devils, angels, and fallen.

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