The supporting character's harem is very normal - Chapter 46 Face slapping - The first heroine (5)

Abandoned on the battlefield, all he could do was endure the hellish life. He had no family to rely on, as they had turned their backs on him.A soul from the battlefield, Lucavion Thorne.But apparently, he was a lot more than a mere soldier, as fate had many things stored for him.A soul from Earth....When they merged, he realized.He was a one-chapter villain whose sole purpose was to serve as a background setting for the protagonist's tragedy.But was he truly a one-chapter villain, or did fate still have some tricks up its sleeve?Watch the story of Lucavion Thorne as he finds the purpose behind his transmigration and discovers his own fate.

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?