Assassin Travelling Worlds

R-18 ? Yes it is there.
Axel Murphy is a normal looking guy who has a very simple and normal life. He is a college student whom no one ever wanted to be in their group. So all of his life was loner. And since he is an orphan there was also no one in his family. And in all of his life he was tormented and bullied by others until one day when fate brought the mysterious and powerful Assassin System into his life.
This system is about to change the entire life of Axel in a way he has never imagined his life would take such a drastic turn.