Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Book 6 - 6-32. Mortal Combat with the Demon?!

The female protagonist of this book is a zombie (probably!) The male protagonist of this book is an air (maybe, but you can’t see it?) The system of this book is a bastard (like to open a mouth too much?) Anyway, this is a story about zombie with a memory, going back to the past, but accidentally turning this book into a story of a savior! (Huh? What? There is a killer? No, believe the author, she really did not kill, really! (No wonder!)

The heroine said: The title of the book and so on are all fake!

- Description from Novelupdates

Book 1 Sold? [Volume 1]The most frightening thing a girl can imagine is being abandoned. But what's worse?Being sold at an auction, naked and afraid and then being bought as a toy.Rosalie never thought she would actually end up getting sold at an auction. Her life wasn't all flowers but still she didn't want to end up a salve. When the worst was happening she gets sold to a billionaire.Book 2 Owned? [Volume 2]Getting chased by gangsters, getting kidnapped and then forced to become a slave of one of the biggest Mafian boss of the country was Azalea's greatest nightmare.But to make it worse the kidnapper was the man Azalea had hated all her life for depriving her of her only familyBook 3 Captive? [ Volume 3]After the disappearance of Azalea, Arius always found himself lost in thought about her. He never got over her but what happens when a little ball of joy enters his life and becomes a path for finding his lost love again?

Ye Fan accidentally obtained a billion crystal technology system, and since then, he has become out of control.

Android: You do n’t even have a mobile phone system. I want to make it impossible for you all!
Ye Fan: Sorry, I researched it out, it seems to be more powerful than yours!
BMW Benz: Our engines are famous all over the world!
Ye Fan: Sorry, I do n’t have an engine, I only have magnetic levitation, and the speed is only a few times that of yours. Do n’t worry, take your time!
…
Enemy: Is he still human?
Who can stop this!

- Description from Qidian

A relentless young man, a shadow of a dragon soul sword, a legendary immortal saga.Who will be the peak in the battle for imperial supremacy, only I, Lin Xuan, despise all living!