Kill to evolve into Demon.

I am an normal high schooler, no I was a normal highschooler who got himself a system who will evolve into Demon Soul if I were to kill those bastard who came in my way. I had an happy family of three when one day a someone tried to invade my family and my happiness, I tried to bear with it but I ended up becoming more and more thirsty to kill someone, it was pretty normal for a guy who was obsessed with his family happiness given he had already given them all the sadness he could offer in the past few years. For him his family was the only place he was able to breathe happily and live happily but when a ruffian try to invaded whatsoever no reason for, I truly just wish to kill him in various manner that I can think of but the fear of getting caught by police officers or cops, I try to refrain myself to the end. *Ding, do you want to kill, then just kill, I will erase every possible thing which will come in your place to kill more and more, before you will become the Demon King.* Warning this is not something for people with light heart and remember if you are reading it then shut up if you have any problem with this writing, given I will enjoy writing about this and I hope you can enjoy reading about this to let out your frustration inside your heart.