Zombie's Daily Salvation

The heroine of this article is a zombie (probably!) The male protagonist of this article is a piece of air (maybe, but you can't see it?) The system in this article is a bastard (like to talk a lot?) Anyway, it's a story about watching a zombie go back to the past with a memory, but accidentally turned himself into a savior! (Eh? What? What is seeking death? No, believe the author, she really didn't seek death, really! (It would be strange not to have one!) The heroine said: The title of the book and so on are all fake!