What did the Apocalypse Gate say?

The Doors of the Apocalypse is a novel created by a great writer "Dancing". The story tells that an earthman entered the replica world in an airplane accident, which became a loophole in the game. He found that he was only an npc, but he accidentally got the player's system (although castrated). He used the game gm against the development team because the end of the game meant the destruction of the world. In this process, the protagonist got to know many "NPCs", and they fought for their own destiny together.

Strictly speaking, The Doors of the Apocalypse is a bit like infinite flow's novel. The protagonist will experience many copy tasks, and each copy has its own unique world and different types of tasks. After that, I traveled through time and space in Zero City to return to the past scene, a bit like the protagonist in "Full-time Boss" used his brain to predict the future plot.