Pretending To Be God - Chapter 8: Castle Part 3

Zheng Tan somehow returns to the year 2003, turning into a black cat. Picked up from a rubbish heap by the Jiao family, he is given the name “Charcoal”, and so begins the life inside Professor Jiao’s family. Zheng Tan remembers that he was once a person, but currently his body is that of a cat. He has no way of speaking the human language, but can understand it, and even retains the thinking and IQ of a young 20 year old youth. Read along as he adapts to this new world, and somehow tumbles from a group brawl to catching a thief.

- Description from Novelupdates

Leng Pan never expected her late-night rant after reading a book about the apocalypse to change her life forever.Frustrated by the sheer stupidity of the second female lead in the novel; Apocalypse Rebirth', she criticized her tragic death, and the character’s blind loyalty to the female lead. But when Leng Pan wakes up, she finds herself inside the very novel; as the second female lead!She realizes she had transmigrated into the novel on the day she’s meant to hand over the jade bangle with a space to the so-called “best friend” who would betray her. With only seven days left before the world falls into chaos, Leng Pan refuses to follow the script. Instead of giving up her greatest advantage, she uses it to stockpile supplies, distances herself from the scheming reborn heroine, and most importantly; fights for the love of the male lead who once died trying to save her.Armed with foreknowledge, Leng Pan will change her fate. No more being used as a stepping stone. No more tragic endings.This time, she will survive. And she will thrive, even in the apocalypse.But what happens when the butterfly effect of her transmigration changes the script? Will her plans fail to keep up with the changes or will she rise above the author’s imagination and write her own story with the man who would kill and die for her?

I originally thought this was a world like an ordinary urban novel…Drawing comics by myself, traveling is pretty good.
But tell me, what happened to this magician called “Emiya Kiritsugu” who jumped on my face?
Who changed the settings?
Currently involved in the content of “F/Z”, “F/SN”, “Fantasy Carnival”, “The Emiya’s Meal”, “The Holy Grail of the Imperial Capital”, “FLA”, “Elmello II Event Book”, “FGO”, “FE”, etc.
Others related to “JOJO’s Bizarre Adventure”, “Rebellious Lelouch”, “Persona 5”, “Attack on Giant”, “Death”
“FGO”, “FE Series”, “FA”, “FSF”, “Cangyin”, “Magical Girl Illya” will be involved next…

- 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?