I'm the Mysterious Leader of the Salvation Organization - Chapter 457:

When we met for the first time in our first year of high school, he saw my contempt, but silently continued to clean;

Insane. Traitor. Terrorist.

“You wouldn't force me, would you? I thought you hated me,” I plead.“I do,” Matthew hisses, his eyes flashing dangerously as he rips open my dress.Sarah Wilson's dreams of a perfect marriage shatter as Matthew's hatred for her is revealed on their wedding night. She had always loved him in secret, but now she realizes the ultimate truth - he despises her.Will Matthew ever see past his bitterness and realize they are meant to be together? Or will he make Sarah suffer until death finally separates them?

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