Rakuin no Monshou - Volume 9, Chapter 6: Preliminary Skirmish

Mu Zhiyan, after being transmigrated a millennium (1000 yrs) into the future, discovered that he was raised by his adoptive parents as a tool for them to access the heritage his (dead) biological parents left behind. When he was at a loss for what to do next, he discovered that his body hosted an additional
pharmaceutical system.

For a chance to return to his era of Earth, Mu Zhiyan decided to practice and practice; he must train the system to full level as soon as possible.

However, reality gave him a slap in the face. The world is dangerous and dreadful, making Mu Zhiyan recall his mother’s words of holding a thick thigh, resulting in him locking his eyes on a cool general…

So the rumored mysterious Mu Master faced General Han with a serious face: “I allow you to follow me, General Han.”

General Han: “…”

- Description from Novelupdates

Jinhyuk, a gaming Nutuber, was the only person who saw the ending of the game [Tower of Trials].

However, when the game’s popularity declined, it became difficult for him to continue making a living as a gaming Nutuber.

Since he already saw the ending of the game, he was about to quit playing. But that day, [Tower of Trials] became reality, and Jinhyuk, who knew about every single thing in the game, took over everything faster than anyone possibly could! “I’ll show you what a true pro is like.”

Le Xia traveled to the Marvel world. He was born ordinary, but after encountering a dilapidated bronze box, his life was destined to be extraordinary.

“Put on the holy clothes and protect the love and justice on the earth!”

The moment he touched the box, these words were imprinted into his soul.

Whether it’s evil spirits in the dark, covets in the starry sky, or “gods” who regard all living beings as playthings, all evils that try to disturb the peace of this land will face the justice of the saints.

When the golden holy clothes reflected the dazzling starlight and the white cloak fluttered without wind, the legend of the Saint Seiya began to spread throughout the Marvel universe.

- Description from novelbuddy

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?