The Villain I Killed Came Back to Life

"I had no idea such a rat had snuck into my mansion." One year into my possession, I got caught while trying to rob the villain's safe! But then, the villain got shot and killed by the gun I pulled out to threaten him as he approached. Just as my mind went completely blank, <You have been killed by an Outsider from 'Outside the World', the first of its kind for humanity! Reward: Resurrection Ability> The villain I killed came back to life. Complete with a status window and a resurrection ability! --- In a world where demonic beasts appear every single day, I figured I had to survive first, so I tried to persuade the villain to save the world. "How delighted I was that you contacted...