Isekai Maou to Shoukan Shoujo Dorei Majutsu - Volume 6 Chapter 1 part4-5

As the daughter chosen by the Heavens, she was already extraordinary from birth. However, with her talents concealed, she was treated like tr*sh and mercilessly betrayed. So, she decided to let her supreme capabilities shine!

From then on, her bloodline had been awoken. Everything was possible—refining antidotes and weapons through alchemy, taming the dragons and phoenixes, and even being the ultimate ruler of the world. Since then, millions of people admired her and she lived up to her name as the strongest concubine in the world!

Only that cold, evil and immensely domineering Ice Emperor, whom she had accidentally provoked, loved, protected and helped her everywhere…

“Oh dear, after he has treated me like that, how can I ever like someone else? This man is really cunning!”

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.

As a great swordsman who had reached the top level of 999, Lin Feng was hailed as the best swordsman cultivator that the World of the Nine Continents had seen in a thousand years. His sword techniques were exceptional and exquisite.

However, just as he was about to able to enjoy a leisure life, he welcomed another transmigration.

This time, he had transmigrated into a female-dominated world. Women were responsible for providing for the family while men just had to look pretty.

On his first day of school, Lin Feng received confessions from two rich, beautiful, and wealthy girls. The first even promised him a comfortable life as long as he obeys her.

A max-level swordsman in his previous life, Lin Feng would never allow himself to depend on a girl. Thus, he set out on his cultivation journey once again. He would forge a world for men in this matriarchal society.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates