These are the major steps to find the evil within:
1) Turn on the game.
2) Start a new game.
3) Choose AKUMU difficulty mode.
4) Don't upgrade anything.
5) Dont pick up any guns.
6) Get to chapter 3 (this is a major part that is very helpful for the task).
7) Try to fight the Sadist in the barn.
8) Good luck and have fun.
9) Try to do this until your mum/wife enters the room or calls you for dinner.
10) Get very salty and angry.
11) Go to your mum/wife and burst in salt for your incredible loss against the Sadist.

Good! Now the world knows about the evil within YOU! Who needs the game when you can find this diamond.

I want to thank you for reading my helpful guide.
To people who didnt understand, this is a joke guide.