Invasion of All Realms, I Started the Simulation from Demon Slayer

I opened my eyes and found that I had traveled through time. I found that the entertainment level of this world was not high. I wanted to make a career as a porter, but I died before I left. I found that the world was invaded by various monsters. I am a person with no power. Isn't that a gift? People often have bad luck, but once they get over it, they will find that there are still more bad luck. I was carrying the code at home honestly, but a monster broke in through the window. I wanted to leave quietly but was discovered by the monster. Just at the critical moment, the system came! He's here, he's here with his stereo! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.