Class in another world

A highschool campus suddenly felt a strange aura in their surrounding. A light appears on their ground, covering them with a bright light. The whole campus got transported in another world where they will faces some challenges that can literally kill them if they didn\'t finish it. Our protagonist, Yuri has been abandoned by his friends and obtained a system that will help him to grow stronger. Along his journey, he will met some new friends from different class that has been abandoned or betrayed by them too. Together they will win the game, until they came back where they belong.