Possessed on the First Day, I Became the Emperor

I became the rogue prince in a game.

I’m at the very bottom of the line of succession, and the world is doomed—but I don’t worry.

After all, the game’s protagonist will fix everything.

I can just live a comfortable life safely in the rear.

But on the first day of possession, the protagonist died.

…Now I have to stop the world from ending.