I Guard The Book That Slays Gods - Chapter 9: Assassin Deal

There was a Senior Brother and a Junior Sister. One of them was transmigrated to this world and had cheats while the other was the reincarnation of a Great Emperor.

Ronald Kuangge transmigrates into an urban novel called “The Dragon King in The World” as a Rich Second-Generation that has to properly play his role as the Villain according to the plot in order to return back to earth.After finishing his villain role accordingly to the plot however, instead of going back to earth he has dreamt so long of doing, he ends up going back to the beginning of the story where he has do everything over once again.So in order to go back to earth, he has to act like a villain according to the story once again.Little does he know this time however, the heroines have also regressed back as well...

An anime otaku who has traveled to the world of full-time hunters, in order to live well, he can only keep getting stronger all the time, burying the strong one after another. Your withered life will be continued by me.

- Description from novelbuddy

In her third year living in this steampunk world, Ciel gained the ability to simulate both the past and the future.These simulations turned into a game where she could act without restraint, and after countless trials, real life became a replica she could navigate as though speedrunning it.Churches, potions, mutations, the Old Gods, witches, sealed artifacts… none of these have anything to do with Ciel. She’s just an ordinary girl who wishes for a peaceful life.She just happens to be particularly skilled at snuffing out danger before it even begins.