High School DxD - Volume 17 Chapter 5.1

In the 312th year of the Great Yu Kingdom, the Demon Sect suddenly rose, the Eastern Bureau was annihilated, and the Lin faction collapsed. This year, the situation changed dramatically, the martial arts world was filled with intrigue, and the dynasty was on the brink of danger.The starting point of everything was due to the Demon Sect Saintess dying an untimely death.“This case is now closed, and you are no longer a suspect.”After another round of investigation, Chen Yi returned home and pushed open the door.The Demon Sect Saintess, who should have been dead, was curled up trembling on his bed...“Master...”She called out to Chen Yi.The enemy of the previous life, now a concubine in this life.…………………The Empress Dowager who controls the court, the pure and flawless Demon Sect Saintess, the ninth-ranking one-armed sword master of the world, the emotionless Taichua Goddess, the chivalrous and tender-hearted Spring and Autumn Sword Master...They are all my enemies, all once wished me dead.In the end, they all resigned themselves to subordination, swallowing their shame.

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

When a glowing portal yanks Leo from his struggling existence, he is saved by a mysterious system which gifts him new chance to break free from his side character experienceRebuilding an abandoned guild to honor his family’s legacy, Leo finds himself under the evil eyes of monsters, both from humanity and the gates he ventures intoin short : overpowered necromancer building a guild.

Nero was an orphan boy who one day went to sleep like any other day in his apartment. However, what he did not know that the moment he slept, it would be his last day of life...Or at least that was how it should be.Nero's soul wandered between the worlds and ended up entering the body of a girl who was trapped in a human mutation laboratory. While the girl's soul was still alive, he hibernated inside her body.After so many tortures, the girl named “Zero” in the laboratory died. But, it didn't end there, when the girl died, something very strange happened, something took control of the girl's body and that same thing escaped the laboratory.It was when Nero what that was hibernating in the girl's body woke up and realized was completely naked. In addition, he realized that he turned her into a beautiful winged woman with white hair and some pink strands.