Isekai Maou to Shoukan Shoujo no Dorei Majutsu - Volume 9 Chapter 2 part1-9

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?

- Description from novelbuddy

Elias' world was destroyed right in front of his eyes. Only after his transmigration did he learn that there was nothing natural about its destruction.“Mother, I passed my Practical Exams! I was so lucky to get a weak world like Earth for my practicals! It only took a few months!”The person who destroyed his world was the eldest son of the family he was transmigrated to, the Ashborns.He could never forget his sister's cries when she suffered and eventually died from the virus that wreaked havoc in his world. And here he was, the person responsible, laughing.Elias wanted to repay the favor. He wanted to bring absolute ruination to these people. And for that, he had to play by their rules. He had to become the Architect of an Apocalypse…

When a glorious old civilization was toppled overnight, a strange purple moon rose and thus began the Purple Moon Era.

Yu Mian has been an orphan since she was a child. Fortunately, she has a kind person to support her, and the kind person is a starlet.
With gratitude, she became the little star’s first fan, sent him messages of encouragement, helped him make the rankings, and helped him tear up the sunspots for him, and accompanied him from obscurity to the top of the entertainment circle, and won the actor trophy.
Yu Mian thought that she would silently protect him for the rest of her life, but in a car accident, she transmigrated into Yu Mianmian, the fiancée of the movie emperor’s family.
On the first day of transmigrating, the film king appeared in front of her. Before Yu Mian could recover from the joy of seeing the idol, she saw a man with a cold face handing over a piece of paper.
The voice was low and indifferent: “We are just a family marriage, we just need to play around.”
Yu Mian Xingxingyan nodded, took the contract and smiled so much that she couldn’t see her teeth. Idols are for looking up to. As a qualified fan, being able to get close to her is enough to satisfy her.
Once dressed as a wealthy lady, Yu Mian, a commoner, just wants to eat and wait to die, and spend money and money on idols!
But why did the idol, who said he was good at acting on the occasion, look more and more wrong in her eyes?
One day, the film king blocked her in a corner: “When will our marriage be held?”
Yu Mian blinked suspiciously: “Didn’t you say you don’t want to get married too early?”
The film emperor gritted his teeth secretly: “I changed my mind, and suddenly wanted to try what it would be like to be called my husband.”
Lin Jianshen: I call my husband every day on the Internet, when will I actually call him once?
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【Daily Stream/Sweet Cookies/No Cruelty No Scum】
The author is not in the circle, please forgive me if there is any inaccuracy.

- Description from novelbuddy