Ascendant Across Realities. - Chapter 37 - 36: Countermeasures.

Earth, thousands of years after the apocalypse.

Countless technologies and advances had been lost to time as the Specters, horrifying beings with terrifying powers, arrived and destroyed the world.

Over the coming thousands of years, humanity had built itself up but always died again.

Nobody remembers the past.

Nobody remembers what humanity had once accomplished.

Now, everyone is living in a world where the Specters reign supreme.

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A boy with amnesia woke up in the middle of the Dregs, the worst part of Crimson Fungus City.

The boy grows up and manages to become strong enough to pass an exam for one of the most prestigious jobs in existence, a Zephyx Extractor, someone that can harvest the powers of Specters.

Sadly, he had already gained a power from a Specter in the past, which made him ineligible for the position.

But then, a mysterious man visits him.

And his luck finally turns around.

……………………………………………………………

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In a certain world, there was someone who excelled in magic combat, people called him 『Sage』. Seeking the strongest combat art, he devoted himself to research every magic and combat arts in existence. And the conclusion he arrived at was very cruel, 『My body is not fit for magic combat』. Yet he didn’t give up. He sealed his own soul with a magic art, and was reborn in a far-off future. And the magic theory in the completely changed world he saw there was of unbelievably low level.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

A side story series featuring the girls of Kyoukai Senjou no Horizon.