Shine leow of Hell as Game of Survival

That day was sunny. As usual all where living there live as normally they do. That day I was goofying in store room . I found one of the old artifact (it was cylinder in shape , small in size and have a lock also a key near by ) I took that artifact to my school as I was running late that day. I planned to show to my friend and open that there in front of my friend, Disuki . I reached the school and I told him all about how I find it . Then at halftime of the school we decided to open it ( We didn't know it was at the cause of all our problem ). I open that artifact using the key then suddenly I had a vision in which whole the people of world has been dead expect us who were in school are . My eyes has tear then my friend said what happened to you why are you crying? I was out of vision and I told him what I saw . Just after telling within 30 second my vision came to be true...We all where teleport to the field of our school along with all students, teachers,some parents who were came to visit school and all staff member. We don't know what was happening all you confused and how this is possible what the hell is going all (Students were telling that is happening why we are here , is this dream I think what a weird dream, Are we all dead ? ) Then suddenly a mysterious boy appear in the sky ( above us ) and said Hello to you all , I am the god of this world or welcome player of my game . This whole world is you playground. Only you are live in this world so everything in the world is your , do what you want to do. But you know this is the game of Survival. So, there will be monster who will kill you just like an adventure or iskai anime. Beware of monster and law of game is very simple you just need to survive and gain the rank of C⁵ Human class . Each of you will get power some special power according to your true nature and a phone with special power of recognizing monster class and there power and some weakness. If you level up yourself then each achievement of level , you will learn new and powerful skill .You will be divide and teleported according to you class. Good luck...