Days with the demon queen - Chapter 2: Master and Servant

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

Most people don't choose reincarnation.

Reincarnation finds their way to them.

Perhaps they did something great in their life.

Or maybe truck-sama wasn't looking where it was going.

But without fail, those who reincarnate are destined for something great.

A new life where everything changes for the better.

But...

Reincarnation isn't always the greatest thing.

Sometimes you just draw the short end of the stick.

Di Tou just happens to have drawn the shortest stick.

Pulled out of his life randomly.

Taken by a crazy old eccentric man not as a disciple, but as a body double?!

And a janitor body double no less?!

Grasping a system to find... It's a JANITOR SYSTEM!?

Truly, how unlucky can one get?

……………………………………………………………

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Yi Ti resented her name. From an early age, she couldn’t get away from the nicknames “ET” and “alien”.

But no one thought that one day, she would actually meet an alien.

Scared by the other, it seemed like she screamed……

She fainted, then fell face down or something like that……

She seemed to have gotten a bloody nose from being knocked out……

She doesn’t remember any of this!!!

The only thing she cares about is that after she fainted, the alien actually dragged her, chest down, back home – does the alien not feel ashamed?!

- Description from Novelupdates