Ryuu Kusari no Ori -Kokoro no Uchi no “Kokoro”- - Chapter 2[LN] Volume 4: .

This world is Heaven.

Because this world has everything you dream of, everything you wish for.

This world is Hell.

Because everyone in this world are parts of a never-ending massacre.

Are you fighting to survive, or fighting to come home?

- Description from Novelupdates

When low-level healer Elias Vale stumbles upon a cursed cocoon in a forgotten ruin, the last thing he expects is to hatch the reborn soul of the Demon Queen Revantra—in the form of a scared little girl.To save her from divine execution, she binds herself to him through an ancient soul pact, fusing their fates. Now, Elias is stuck raising the former destroyer of worlds—who can barely tie her shoes, but occasionally melts furniture when she pouts.What starts as reluctant guardianship soon spirals into something far more dangerous. As Rhea (her new alias) grows stronger, older, and far too attached, Elias must keep her identity hidden from zealous church inquisitors, ambitious heroes, and the remnants of her own loyal followers—some of whom want her dead... again.But the longer he protects her, the deeper the bond grows—and the harder it becomes to tell who’s really taming who.Because the world once burned beneath her wings……and this time, she’s not letting him go.

The Demon Lord was as strong as a fly.

So when I swatted him away after sleeping in on the morning of the fight.

The world trembled and the goddess descended.

“Please... Please just fucking go back. I don't want to die.”

And sent me and the hero back to Earth.

Except she had taken away all my powers, and...

[Welcome to the Earth’s Apocalypse - Scenario 1 is currently in progress]

[Congratulations, you have been chosen by the Strongest Dragon God system, would you like to accept?]

HELL. NO.

A system is for losers.

……………………………………………………………

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- Description from novelbuddy