Harem King System: My System is a pervert - Chapter 4: First Lessons

Lianna Velcross, a girl who came from nothing, with no family, no worth to her name, and no place in the world.Enverna Alteri, a young woman carrying the weight of an entire house's expectations on her shoulders.One wants nothing more than to have a purpose, the other has one but cannot possibly fulfill it.These two women who would never have crossed paths normally end up with their fates being intertwined when a Constellation decides to empower them both, on one condition...That these strangers, from different nations with different beliefs, get married.And, both of them accept.---A GL story about a marriage arranged by a higher power!

All Things of this World, Turn to Ashes, Flowing Blade-like Flame!

An RPG gamer who played the realistic VRMMORPG ‘The Amber Sword’ for years, finds himself teleported to a parallel world that resembled the game greatly. He takes on the body of an NPC who was fated to die, and with the feelings of the dying NPC and his own heartrending events in the game, he sets out to change the fate of a kingdom that was doomed to tragedy.

- Description from novelupdates

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?