The Devil's Cursed Witch - Chapter 279 Erlos Aureus Talk

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

“What? The wild chickens I raised are pure blood phoenixes? ““What? The carp I raised are true dragons?”With a wave of hand, the river was cut off; with a slight stamp of foot, the mountain collapsed.A group of incredibly powerful cultivators knelt in front, worshipping and calling ‘senior’.“What the hell wrong with this world?”Li Fan shouted,” Oh no, that’s impossible!”“How could I possibly be a Supreme Master?!”

Ethan Cross was a politician serving as the Secretary of the Department of Energy in the United States of America. He was also an engineer and a scientist prior to his position, to which he was hailed as a “King of Technology” as he was able to invent revolutionary technologies one after the other.But his life was cut short when the vehicle he was in was rammed by a truck from the side, and immediately after, he awakened in the body of a royal prince, Bruno de Elysea, who was a complete opposite of Ethan in terms of knowledge and capability.One thing he noticed is that in this new world, everything was so backward. Technology and politics. He desired to change them but by doing so, caught the eyes of those who opposed it.