Monster Harem In The Tower - Chapter 13: Run!

When natural disasters ran rampant, with extreme cold and storms spreading endlessly…When the world mutated, zombies surged like tides, and eerie horrors emerged…When the apocalypse descended, massive Devouring Abysses hundreds of kilometers in diameter began appearing around the globe…When people looked up at the atmospheric cloud layers and saw the slowly emerging corpse of a colossal evil god…From that day, people began to notice that daylight was arriving later and later, until the sun no longer rose, plunging the world into an unending polar night.For survival, on that day, the Apocalypse Radio made its final broadcast to the world:“Everyone, flee eastward—escape to dawn!”…Lin Xian awakened the [Mechanical Heart] ability. He could devour machinery to gain various mysterious skills, scan machines to obtain blueprints for manufacturing, and even use his thoughts to achieve unified control of different machines.Thus, he found a 200-ton heavy gas-powered locomotive, towing specially modified storage, planting, production, medical, and living carriages, and embarked on a 320,000-kilometer journey along the planetary orbital rail—charging eastward toward the dawn!

I am not that good with synopsis, So please read the first chapter instead.

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After accidentally killing the male lead and changing the course of the story, our Demon Queen finds herself in a very complex situation.

As the final villainess of this world, her mission was to be defeated while making the Chosen Ones stronger.

But fate played a cruel trick on her.

Left with no other choice, she finds herself forced to serve the Female lead to survive.

As the story unfolds, our Demon Queen must navigate her new life as the heroine's servant while also trying to uncover the truth behind her sudden change in fate.

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The prosperity is about to come to an end, and the poor boy quietly rises.

Traveling across time and space, seek the leader of the world.

- Description from novelbuddy

Her – a glutton without troubles or worries who crossed over and became a young fat chick with a deep vengefulness.