System Maniac 2

A New World is a strange place. Everywhere there’s ruin and some kind of System. A bunch of monsters—like zombie titans, giant mentalist cockroaches, and even orcs.
But no less strange is me. For some reason, my memory of my previous life is gone, and all I have with me is a kitchen knife. And also, in the night sky, a message hangs there: [Congratulations! You receive a unique class—“Maniac!”]