The Earth After Rebirth - Chapter 5: Preparations

Demonic forces descended from beyond the skies, and malicious spirits roamed freely, prompting Duan Mingyuan, who faced unemployment, to decide to return to his old profession.Iterative updates in tactics, a second venture.To all you demons, if you must hold a grudge, blame my boss who let me go!Years later, Mr. Mingyuan, now a mentor to demons, made a statement during a media interview:“Yes, at that time it was just a simple job change.”“What?”“What do you mean by 'I am the real demon'?”— The large-scale documentary “How Demons Are Made” continues to air.————————An unbeatable novel, single female lead, a light-hearted read without any angst.With over 10 million words in completed works, you can consume with confidence~

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- Description from novelbuddy

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.