Sacrificial Vote

Life at the Yanagizawa private high school is boring for all attending students who prefer to stare at their smartphones for most of the day, just playing games and chatting to each other. Everyone's dormant lifestyle though seems to awaken when they are asked to vote for a classmate who will be asked to clear a task or otherwise become the sacrifice and suffer a social death! What does this mean though? Who will be the first one to be voted and what is a social death? The students will find out very soon that some games are far from innocent.