I Beheaded My Boss from the Start, Then Proved My Way to Godhood by Slaying Demons

[Refreshing text + fast pace + decisive killing + system]

At the beginning, you travel through the Demon Suppression Department, and you are caught in a life and death crisis. At the critical moment, you awaken the demon killing system!

What? Can you become stronger by killing monsters?

I'm completely crazy and focus on a speedrun!

"Wang Xiu, I have to kill twenty demons this month... What!!! You've already killed a hundred demons?"

"Wang Xiu, come under my command, and I will grant you glory and wealth... What, His Majesty wants to make you a king with a different surname?!!!"

"Everyone!!! We, the demon tribe, are massacring the human race. Today we will report...!!! A human race has already killed us at the door of our house. Everyone, run away!"

…

Human race: I have Wang Xiu, who is invincible in the world.

Demon clan: Am I a demon? He is the monster!!!

Wang Xiu: "I mainly focus on fast speed!"