Ultimate Highschool DxD

It was a day of great joy in the underworld. A child was born in the house of Duke Gremory, the father of this child was Arneus Gremory, the older brother of Zeoticus Gremory and the current head of the house of Gremory.

The child's mother was Serena. She was a pure blooded devil. Arneus had married a lot of women. He had a 84 wives. 72 of them belonged to the 72 pillars. Four of them were from the bloodline of original four great satans. The other eight belonged to the extra demons. All of them had children. The children were girls.

Arneus had about 84 daughters, one from each of his wives. One day, he did a ritual. As a result, all of his wives merged into one woman. Her name was Serena. She got pregnant with Arneus's child.

This child had the blood of 72 pillars, the original four great satans and the blood of the extra demons running through his veins.

Doctor: Congratulations!! You have a son, lord gremory.

Lord Bael: Wow! Finally you have a son, lord gremory.

Lord Pheonix: Your son has the blood of all the pure blooded devil families. He also has the blood of Pheonix.

Arneus: Today I'm extremely happy.

Zeoticus: Now you should give him a name, big brother.

Sirzechs: This will be very special. He will be the future of the underworld. He will bear the the family of all the pure-blooded devil families.

Venelena: So what will you name him? I've thought of one.

Serena: His name will be Aerus.

I woke up. I've been named Aerus. My mother Serena is holding me. I feel an immense power within my body. A crimson aura is being release from my body.

Doctor: What is this power!? We can't hold the child. Even getting close to him will disintegrate our body.

Sirzechs: What amazing power!! This level of power is like that of a high-class devil. But he is just a child. Wait a minute! That power is!

Zeoticus: That's the original power of Gremory. This power was only possessed by the original Gremory. No one inherited this power from him. But Aerus has it.

Everyone: It's the Gremory's demonic power of Extinction.

Everyone was surprised by my power. I have returned in the past. I'll become stronger and save this world and protect those who're precious to me.

My sisters were happy to see me, the entire underworld rejoiced on my birth. I met Rias. She was the same age as me.