Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 16 - 16-1. Effect of Slaying Demon Lord

In the end of the world, the fittest survive.

Come back from rebirth, seize the opportunity, just want to survive in the hopeless end times.

Three months before Mu Nan returned to the apocalypse, he sold all his savings to accumulate supplies, hoarded everything he could hoard like a hamster, and then huddled in his own house and lived a low-key life, carefully waiting for the apocalypse to come step by step…

- Description from Novelupdates

Fifty years ago, Dragon City transmigrated to the Other World. Alone in the world, they lifted the banner of Earth’s civilization and fought against the terrifying forces of the Other World.

Evolution, it is the process with which the most fit for survival pass down their winning traits. What if this could be done on one animal, one object, one person, what traits would evolve.

...

Humanity has been entered into the grand inter-realm competition for sovereignty of all realms.

Darwin has been granted the gift of evolution

twelve years ago.

The queen gave birth to a princess, who claimed to be the prince, named Xia Shimin.

three years ago.

Xia Shimin was established as the prince, and made a marriage contract with the current Taifu’s daughter to stabilize the imperial power.

…

Zhang Ronghua had traveled through time when she was born, hereditary and hereditary, her roots were straight and her roots were straight, and she was an upright Forbidden Army. He had been in the palace for fifteen years, and his talent would increase a little with each passing day.

Seeing that the prince’s wedding was getting closer, he accidentally broke the body of the prince’s daughter.

The night of the wedding.

Prince: “You can replace the lonely bridal chamber!”

- Description from novelbuddy