The two people in the room with you are Shuichi and Kaede. You've been in that room but got your memory erased, lost all memories from your life before and exchanged for new ones. This is actually a killing game and other students are forced to participate as well without any memories of their life too. Your only way of escape is to kill someone and get away with it. Same goes for the rest. Try not to get killed and find the culprit. Try to survive and escape until there's only two survivers.