DxD: The fake X fate - Chapter 1 -: pentagonist

One day I was suddenly thrown into a fantasy world with my sister,bff,fav. actress,milf next door, fav. pornstar,etc...There I also met several mystical women from different species like mermaid,elf, Demonic, warrior, village girl,etc...But who was the mysterious motherly woman who brought me here?What was her motives?All I remember is that few days ago I....

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

I possessed the weakest character in my favorite game’s Hell Mode. I want to survive, but the way the main character is being controlled is atrocious.

It can’t be helped.

I have to stop the bad ending myself.

Li Yi accidentally obtained a black science and technology library, which contains countless books of the inheritance of high-tech civilization and records countless knowledge.

There are thousands of bells in the book, there is a golden house in the book, there are many horses in the book, and there are Yan Ruyu in the book.

Li Yi has completely turned into a bookworm, learning all kinds of knowledge from the library, grand unified theory, particle Tebo theory, …, acquiring various black technologies, superconducting materials, super batteries, intelligent algorithms, … .

- Description from novelbuddy