One Piece: New Order - Chapter 21: Promotion

This isn't just a game for me, it's a fckin war! And I will conquer it, no matter what…… I'm coming for it all!A wild journey of a boy from Japan named Haruma Kusaka, who hates Football the most… Yet is obsessed with winning everything that exists in this game, creating a legacy that no one can ever match.

Kurono Maou is a high school student who is sensitive of his sharp eyes and bad expression. No girlfriend but gifted with friends in his own way, he had been living a peaceful life.

Within the Immortal Realm, there were nine thousand major realms, with three thousand at the top, three thousand in the middle, and three thousand at the bottom, along with countless minor realms.

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